diff --git "a/demonstrations/jbygwlp/axtrees/page-70-1.json" "b/demonstrations/jbygwlp/axtrees/page-70-1.json"
new file mode 100644--- /dev/null
+++ "b/demonstrations/jbygwlp/axtrees/page-70-1.json"
@@ -0,0 +1 @@
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"value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org Yao Zheng", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org Yao Zheng"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "228", "childIds": ["1768", "1769"], "backendDOMNodeId": 648, "browsergym_id": "9ade4746-3e44-4a3b"}, {"nodeId": "624", "ignored": false, "role": {"type": "role", "value": "listitem"}, "chromeRole": {"type": "internalRole", "value": 115}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [{"name": "level", "value": {"type": "integer", "value": 1}}], "parentId": "229", "childIds": ["1770", "1771"], "backendDOMNodeId": 652, "browsergym_id": "efce76a3-bd29-4fc7"}, {"nodeId": "625", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The ability to manipulate fluids has always been one of the focuses of scientific research and engineering application. The rapid development of machine learning technology provides a new perspective and method for active flow control. This review presents recent progress in combining reinforcement learning with high-dimensional, non-linear, and time-delay physical information. Compared with model-based closed-loop control methods, deep reinforcement learning (DRL) avoids modeling the complex flow system and effectively provides an intelligent end-to-end policy exploration paradigm. At the same time, there is no denying that obstacles still exist on the way to practical application. We have listed some challenges and corresponding advanced solutions. This review is expected to offer a deeper insight into the current state of DRL-based active flow control within fluid mechanics and inspires more non-traditional thinking for engineering.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The ability to manipulate fluids has always been one of the focuses of scientific research and engineering application. The rapid development of machine learning technology provides a new perspective and method for active flow control. This review presents recent progress in combining reinforcement learning with high-dimensional, non-linear, and time-delay physical information. Compared with model-based closed-loop control methods, deep reinforcement learning (DRL) avoids modeling the complex flow system and effectively provides an intelligent end-to-end policy exploration paradigm. At the same time, there is no denying that obstacles still exist on the way to practical application. We have listed some challenges and corresponding advanced solutions. This review is expected to offer a deeper insight into the current state of DRL-based active flow control within fluid mechanics and inspires more non-traditional thinking for engineering."}}]}, "properties": [], "parentId": "230", "childIds": [], "backendDOMNodeId": 656}, {"nodeId": "626", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Introduction", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Introduction"}}]}, "properties": [], "parentId": "233", "childIds": [], "backendDOMNodeId": 661}, {"nodeId": "627", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Despite many successful research efforts in the past decades, modifying the dynamics of flows to induce and enforce desired behavior remains an open scientific problem. In many industrial fields, researchers have placed great expectations on flow control techniques for engineering goals [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Despite many successful research efforts in the past decades, modifying the dynamics of flows to induce and enforce desired behavior remains an open scientific problem. In many industrial fields, researchers have placed great expectations on flow control techniques for engineering goals ["}}]}, "properties": [], "parentId": "234", "childIds": [], "backendDOMNodeId": 663}, {"nodeId": "628", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "1", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "1"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "234", "childIds": ["1772"], "backendDOMNodeId": 664, "browsergym_id": "df0b62c5-0315-4f89"}, {"nodeId": "629", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\u2013", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\u2013"}}]}, "properties": [], "parentId": "234", "childIds": [], "backendDOMNodeId": 666}, {"nodeId": "630", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "3", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "3"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "234", "childIds": ["1773"], "backendDOMNodeId": 667, "browsergym_id": "789c59f7-bdb1-4e4b"}, {"nodeId": "631", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], such as drag reduction, noise suppression, mixing enhancement, energy harvesting. Due to the aggravation of carbon emissions and the greenhouse effect, controlling transportation drag or aerodynamic lift has become increasingly imperative.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], such as drag reduction, noise suppression, mixing enhancement, energy harvesting. Due to the aggravation of carbon emissions and the greenhouse effect, controlling transportation drag or aerodynamic lift has become increasingly imperative."}}]}, "properties": [], "parentId": "234", "childIds": [], "backendDOMNodeId": 669}, {"nodeId": "632", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Driven by the urgent demand from industry, active flow control (AFC) is being developed rapidly to harvest benefits for aviation or marine. As shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Driven by the urgent demand from industry, active flow control (AFC) is being developed rapidly to harvest benefits for aviation or marine. As shown in "}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 671}, {"nodeId": "633", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 1", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 1"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1774"], "backendDOMNodeId": 672, "browsergym_id": "c2651d3b-2f88-4a87"}, {"nodeId": "634", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", Boeing and NASA tested a pneumatic sweeping-jet-based active flow control system on the vertical tail of the modified Boeing 757 ecoDemonstrator in April 2015. Active flow control was used to enhance the control authority of the rudder by mitigating flow separation on it at high rudder deflection, and side slip angles, which provided the required level of rudder control authority from a physically smaller vertical tail [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", Boeing and NASA tested a pneumatic sweeping-jet-based active flow control system on the vertical tail of the modified Boeing 757 ecoDemonstrator in April 2015. Active flow control was used to enhance the control authority of the rudder by mitigating flow separation on it at high rudder deflection, and side slip angles, which provided the required level of rudder control authority from a physically smaller vertical tail ["}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 674}, {"nodeId": "635", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "4", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "4"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1775"], "backendDOMNodeId": 675, "browsergym_id": "a3875df8-6d63-4686"}, {"nodeId": "636", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Whether using fluidic [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Whether using fluidic ["}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 677}, {"nodeId": "637", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "5", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "5"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1776"], "backendDOMNodeId": 678, "browsergym_id": "fd79dd14-f731-4627"}, {"nodeId": "638", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], micro blowing [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], micro blowing ["}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 680}, {"nodeId": "639", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "6", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "6"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1777"], "backendDOMNodeId": 681, "browsergym_id": "84c82e48-430c-4388"}, {"nodeId": "640", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] or plasma actuators [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] or plasma actuators ["}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 683}, {"nodeId": "641", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "7", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "7"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1778"], "backendDOMNodeId": 684, "browsergym_id": "6569affd-7491-4212"}, {"nodeId": "642", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], the critical problem of active flow control is to design a reasonable control policy. The predetermined open-loop manner is the most straightforward choice. Still, the external actuation might be invalid if the evolution deviates from expectations and there are no corrective feedback mechanisms to modify the policy to compensate [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], the critical problem of active flow control is to design a reasonable control policy. The predetermined open-loop manner is the most straightforward choice. Still, the external actuation might be invalid if the evolution deviates from expectations and there are no corrective feedback mechanisms to modify the policy to compensate ["}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 686}, {"nodeId": "643", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "8", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "8"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1779"], "backendDOMNodeId": 687, "browsergym_id": "66fde0a8-731c-4b84"}, {"nodeId": "644", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 689}, {"nodeId": "645", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "9", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "9"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1780"], "backendDOMNodeId": 690, "browsergym_id": "8bba687d-ee23-438e"}, {"nodeId": "646", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. A practical alternative is to adopt the closed-loop control manner [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. A practical alternative is to adopt the closed-loop control manner ["}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 692}, {"nodeId": "647", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "10", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "10"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1781"], "backendDOMNodeId": 693, "browsergym_id": "099fba46-19e6-4423"}, {"nodeId": "648", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\u2013", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\u2013"}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 695}, {"nodeId": "649", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "12", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "12"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "235", "childIds": ["1782"], "backendDOMNodeId": 696, "browsergym_id": "9e7e52b9-5819-439d"}, {"nodeId": "650", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], where the response is continuous compared with the desired result. Specifically, the control output to the process is informed by the sensors recording the flow information, then modified and adjusted to reduce the deviation, thus forcing the response to follow the reference.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], where the response is continuous compared with the desired result. Specifically, the control output to the process is informed by the sensors recording the flow information, then modified and adjusted to reduce the deviation, thus forcing the response to follow the reference."}}]}, "properties": [], "parentId": "235", "childIds": [], "backendDOMNodeId": 698}, {"nodeId": "651", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 1", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 1"}}]}, "properties": [], "parentId": "237", "childIds": [], "backendDOMNodeId": 701}, {"nodeId": "652", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "238", "childIds": ["1783"], "backendDOMNodeId": 703, "browsergym_id": "5ad71047-00ba-4923"}, {"nodeId": "653", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "238", "childIds": ["1784", "1785", "1786", "1787"], "backendDOMNodeId": 705, "browsergym_id": "fa8200fd-fc54-4362"}, {"nodeId": "654", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In both ways, extensive work has been carried out by numerical simulations and experiments on exploring the nonlinear dynamics and underlying physical mechanisms of the controlled system with effective control law. For example, Xu et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In both ways, extensive work has been carried out by numerical simulations and experiments on exploring the nonlinear dynamics and underlying physical mechanisms of the controlled system with effective control law. For example, Xu et al. 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It was found that the Co-flow wall Jet had a mechanism to grow its control capability with the increasing adverse pressure gradient. Sato et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] investigated the separation control mechanism of a Co-flow Wall Jet, which utilized an upstream tangential injection and downstream streamwise suction simultaneously to achieve zero net-mass-flux flow control. It was found that the Co-flow wall Jet had a mechanism to grow its control capability with the increasing adverse pressure gradient. Sato et al. ["}}]}, "properties": [], "parentId": "241", "childIds": [], "backendDOMNodeId": 718}, {"nodeId": "657", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "14", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "14"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "241", "childIds": ["1789"], "backendDOMNodeId": 719, "browsergym_id": "f9250e39-acd0-4e69"}, {"nodeId": "658", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] conducted large-eddy simulations to study the separated flow control mechanism by a dielectric barrier discharge plasma actuator. From flow analysis, it was seen that an earlier and smoother transition case showed more significant improvements in the lift and drag coefficients. Moreover, the lift coefficient was improved since the actuation induced a large-scale vortex-shedding phenomenon.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] conducted large-eddy simulations to study the separated flow control mechanism by a dielectric barrier discharge plasma actuator. From flow analysis, it was seen that an earlier and smoother transition case showed more significant improvements in the lift and drag coefficients. Moreover, the lift coefficient was improved since the actuation induced a large-scale vortex-shedding phenomenon."}}]}, "properties": [], "parentId": "241", "childIds": [], "backendDOMNodeId": 721}, {"nodeId": "659", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "While in many engineering applications, traditional large-scale physics-based models are intractable since it is required to evaluate the model to provide analysis rapidly and prediction [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "While in many engineering applications, traditional large-scale physics-based models are intractable since it is required to evaluate the model to provide analysis rapidly and prediction ["}}]}, "properties": [], "parentId": "242", "childIds": [], "backendDOMNodeId": 723}, {"nodeId": "660", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "15", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "15"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "242", "childIds": ["1790"], "backendDOMNodeId": 724, "browsergym_id": "ea8cd188-cd0e-48bf"}, {"nodeId": "661", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\u2013", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\u2013"}}]}, "properties": [], "parentId": "242", "childIds": [], "backendDOMNodeId": 726}, {"nodeId": "662", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "17", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "17"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "242", "childIds": ["1791"], "backendDOMNodeId": 727, "browsergym_id": "db641b1b-5517-4f14"}, {"nodeId": "663", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. The model reduction offers a mathematical foundation for accelerating physics-based computational models [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. The model reduction offers a mathematical foundation for accelerating physics-based computational models ["}}]}, "properties": [], "parentId": "242", "childIds": [], "backendDOMNodeId": 729}, {"nodeId": "664", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "18", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "18"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "242", "childIds": ["1792"], "backendDOMNodeId": 730, "browsergym_id": "917785a8-91ea-40c2"}, {"nodeId": "665", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\u2013", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\u2013"}}]}, "properties": [], "parentId": "242", "childIds": [], "backendDOMNodeId": 732}, {"nodeId": "666", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "20", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "20"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "242", "childIds": ["1793"], "backendDOMNodeId": 733, "browsergym_id": "f4a11ccf-f880-4f4c"}, {"nodeId": "667", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Alternatively, the model-free approach does not rely on any underlying model description of inputs to outputs. A significant advantage of a model-free manner in flow control is that it can avoid detailed identification of high-dimensional and nonlinear flow attractors, which would even shift during the regime. Moreover, with the development of machine learning techniques, it is possible to gain massive data. The control policy must grasp the embedded evolution rules and form data-driven logic. Namely, these model-free algorithms can simulate, extend and expand human intelligence to some degree.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Alternatively, the model-free approach does not rely on any underlying model description of inputs to outputs. A significant advantage of a model-free manner in flow control is that it can avoid detailed identification of high-dimensional and nonlinear flow attractors, which would even shift during the regime. Moreover, with the development of machine learning techniques, it is possible to gain massive data. The control policy must grasp the embedded evolution rules and form data-driven logic. Namely, these model-free algorithms can simulate, extend and expand human intelligence to some degree."}}]}, "properties": [], "parentId": "242", "childIds": [], "backendDOMNodeId": 735}, {"nodeId": "668", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As a critical branch of artificial intelligence, deep reinforcement learning (DRL) simplifies a stochastic dynamical system by using the framework of the Markov decision process (MDP) [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As a critical branch of artificial intelligence, deep reinforcement learning (DRL) simplifies a stochastic dynamical system by using the framework of the Markov decision process (MDP) ["}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 737}, {"nodeId": "669", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "22", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "22"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1794"], "backendDOMNodeId": 738, "browsergym_id": "c531b755-24f4-4602"}, {"nodeId": "670", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 740}, {"nodeId": "671", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "23", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "23"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1795"], "backendDOMNodeId": 741, "browsergym_id": "a5e9cf87-32dd-4e6d"}, {"nodeId": "672", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. DRL algorithms can explore and adjust control policies by interacting with the environment like a child, which gets a penalty when making mistakes. In a continuous process of trial and error, the control law in DRL learns how to get sweet lollipops (high reward) and avoid penalties. Besides, DRL utilizes the artificial neural network(ANN) as a function approximator [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. DRL algorithms can explore and adjust control policies by interacting with the environment like a child, which gets a penalty when making mistakes. In a continuous process of trial and error, the control law in DRL learns how to get sweet lollipops (high reward) and avoid penalties. Besides, DRL utilizes the artificial neural network(ANN) as a function approximator ["}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 743}, {"nodeId": "673", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "24", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "24"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1796"], "backendDOMNodeId": 744, "browsergym_id": "8868f3c1-2ec3-40c6"}, {"nodeId": "674", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Based on the such setting, the DRL is embedded as a state representation technology, which makes it possible to deal with high-dimensional complex problems, like Go, StarCraft, Robotics [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Based on the such setting, the DRL is embedded as a state representation technology, which makes it possible to deal with high-dimensional complex problems, like Go, StarCraft, Robotics ["}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 746}, {"nodeId": "675", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "21", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "21"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1797"], "backendDOMNodeId": 747, "browsergym_id": "9bb84be3-4883-452f"}, {"nodeId": "676", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 749}, {"nodeId": "677", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "25", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "25"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1798"], "backendDOMNodeId": 750, "browsergym_id": "e3803e19-8f61-4d67"}, {"nodeId": "678", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\u2013", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\u2013"}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 752}, {"nodeId": "679", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "27", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "27"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1799"], "backendDOMNodeId": 753, "browsergym_id": "3349985c-f5c9-429f"}, {"nodeId": "680", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. As shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. As shown in "}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 755}, {"nodeId": "681", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 2", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 2"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1800"], "backendDOMNodeId": 756, "browsergym_id": "2a720b3d-9986-4507"}, {"nodeId": "682", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", Vinyals et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", Vinyals et al. ["}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 758}, {"nodeId": "683", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "21", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "21"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1801"], "backendDOMNodeId": 759, "browsergym_id": "b8ef61e4-2194-4485"}, {"nodeId": "684", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] adopts a multi-agent reinforcement learning algorithm to train an agent named AlphaStar, in the full game of StarCraft II, through a series of online games against a human player. AlphaStar was rated at Grandmaster level for all three StarCraft races and above 99.8% of officially ranked human players. Similarly, DRL has highlighted its strong potential in fluid dynamics applications, including drag reduction, collective swimming, and flight control. Many excellent pioneers have reviewed the work related to the application of reinforcement learning in active flow control [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] adopts a multi-agent reinforcement learning algorithm to train an agent named AlphaStar, in the full game of StarCraft II, through a series of online games against a human player. AlphaStar was rated at Grandmaster level for all three StarCraft races and above 99.8% of officially ranked human players. Similarly, DRL has highlighted its strong potential in fluid dynamics applications, including drag reduction, collective swimming, and flight control. Many excellent pioneers have reviewed the work related to the application of reinforcement learning in active flow control ["}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 761}, {"nodeId": "685", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "28", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "28"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1802"], "backendDOMNodeId": 762, "browsergym_id": "e0a8ce89-d012-4030"}, {"nodeId": "686", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "\u2013", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "\u2013"}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 764}, {"nodeId": "687", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "32", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "32"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "243", "childIds": ["1803"], "backendDOMNodeId": 765, "browsergym_id": "7a6266b3-cc7b-4110"}, {"nodeId": "688", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. The present paper will further review the latest developments and demonstrate some challenges to constructing robust and effective DRL-based active flow policies.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. The present paper will further review the latest developments and demonstrate some challenges to constructing robust and effective DRL-based active flow policies."}}]}, "properties": [], "parentId": "243", "childIds": [], "backendDOMNodeId": 767}, {"nodeId": "689", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 2", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 2"}}]}, "properties": [], "parentId": "245", "childIds": [], "backendDOMNodeId": 770}, {"nodeId": "690", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": 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In some work, reinforcement learning has also been compared with some algorithms, such as Bayesian optimization [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. In some work, reinforcement learning has also been compared with some algorithms, such as Bayesian optimization ["}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 796}, {"nodeId": "701", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "37", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "37"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1813"], "backendDOMNodeId": 797, "browsergym_id": "bf901ffc-2e71-46c2"}, {"nodeId": "702", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], genetic programming [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], genetic programming ["}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 799}, {"nodeId": "703", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "38", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "38"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1814"], "backendDOMNodeId": 800, "browsergym_id": "c4458832-c140-4c17"}, {"nodeId": "704", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 802}, {"nodeId": "705", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "39", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "39"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1815"], "backendDOMNodeId": 803, "browsergym_id": "2a42f0db-e187-4da1"}, {"nodeId": "706", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], Lipschitz global optimization [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], Lipschitz global optimization ["}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 805}, {"nodeId": "707", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "39", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "39"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1816"], "backendDOMNodeId": 806, "browsergym_id": "38aeb0c2-1977-469d"}, {"nodeId": "708", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], etc. In particular, genetic programming algorithms, closely related to reinforcement learning, can achieve optimal decisions under the condition of an unknown model as well. Although the randomness of exploration brings low efficiency, evolutionary algorithms such as genetic programming are very popular in some problems like multi-objective optimization and global optimization [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], etc. In particular, genetic programming algorithms, closely related to reinforcement learning, can achieve optimal decisions under the condition of an unknown model as well. Although the randomness of exploration brings low efficiency, evolutionary algorithms such as genetic programming are very popular in some problems like multi-objective optimization and global optimization ["}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 808}, {"nodeId": "709", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "40", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "40"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1817"], "backendDOMNodeId": 809, "browsergym_id": "57490862-3b67-4af7"}, {"nodeId": "710", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 811}, {"nodeId": "711", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "41", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "41"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1818"], "backendDOMNodeId": 812, "browsergym_id": "7ae5affa-f843-4af0"}, {"nodeId": "712", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Not only in the field of flow control but algorithms combining evolutionary algorithms and reinforcement learning have also always been expected [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Not only in the field of flow control but algorithms combining evolutionary algorithms and reinforcement learning have also always been expected ["}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 814}, {"nodeId": "713", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "42", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "42"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1819"], "backendDOMNodeId": 815, "browsergym_id": "af84154b-57a4-40ef"}, {"nodeId": "714", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 817}, {"nodeId": "715", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "43", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "43"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1820"], "backendDOMNodeId": 818, "browsergym_id": "626baf9e-886a-446b"}, {"nodeId": "716", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. For brevity, detailed comparison and discussion about the above model-free algorithms are not considered in this review, readers can refer to these papers [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. For brevity, detailed comparison and discussion about the above model-free algorithms are not considered in this review, readers can refer to these papers ["}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 820}, {"nodeId": "717", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "29", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "29"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1821"], "backendDOMNodeId": 821, "browsergym_id": "e902cf7a-653e-4669"}, {"nodeId": "718", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 823}, {"nodeId": "719", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "39", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "39"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "249", "childIds": ["1822"], "backendDOMNodeId": 824, "browsergym_id": "6df7040d-296f-4ba5"}, {"nodeId": "720", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "].", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]."}}]}, "properties": [], "parentId": "249", "childIds": [], "backendDOMNodeId": 826}, {"nodeId": "721", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The rest of this review is organized as follows: Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The rest of this review is organized as follows: Section "}}]}, "properties": [], "parentId": "250", "childIds": [], "backendDOMNodeId": 828}, {"nodeId": "722", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "250", "childIds": ["1823"], "backendDOMNodeId": 829, "browsergym_id": "bd54bc50-e691-4556"}, {"nodeId": "723", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " presents some basic concepts and algorithms of DRL. Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " presents some basic concepts and algorithms of DRL. Section "}}]}, "properties": [], "parentId": "250", "childIds": [], "backendDOMNodeId": 831}, {"nodeId": "724", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "250", "childIds": ["1824"], "backendDOMNodeId": 832, "browsergym_id": "c30dc16e-bd71-43dc"}, {"nodeId": "725", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " offers the application of DRL on fluids problems, and Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " offers the application of DRL on fluids problems, and Section "}}]}, "properties": [], "parentId": "250", "childIds": [], "backendDOMNodeId": 834}, {"nodeId": "726", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "250", "childIds": ["1825"], "backendDOMNodeId": 835, "browsergym_id": "391c28d0-c0a6-4a67"}, {"nodeId": "727", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " shows some innovations and solutions to fluids problems to make DRL-based active flow control more effective. Finally, a summary and potential directions of DRL-based active flow control are drawn in Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " shows some innovations and solutions to fluids problems to make DRL-based active flow control more effective. Finally, a summary and potential directions of DRL-based active flow control are drawn in Section "}}]}, "properties": [], "parentId": "250", "childIds": [], "backendDOMNodeId": 837}, {"nodeId": "728", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "250", "childIds": ["1826"], "backendDOMNodeId": 838, "browsergym_id": "67583852-78a3-4b3f"}, {"nodeId": "729", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ".", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "."}}]}, "properties": [], "parentId": "250", "childIds": [], "backendDOMNodeId": 840}, {"nodeId": "730", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Deep Reinforcement Learning", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Deep Reinforcement Learning"}}]}, "properties": [], "parentId": "252", "childIds": [], "backendDOMNodeId": 843}, {"nodeId": "731", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "This section introduces some basics concepts of typical reinforcement learning framework, and popular deep reinforcement learning algorithms, such as proximal policy optimization (PPO) [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "This section introduces some basics concepts of typical reinforcement learning framework, and popular deep reinforcement learning algorithms, such as proximal policy optimization (PPO) ["}}]}, "properties": [], "parentId": "253", "childIds": [], "backendDOMNodeId": 845}, {"nodeId": "732", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "44", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "44"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "253", "childIds": ["1827"], "backendDOMNodeId": 846, "browsergym_id": "a8237af9-9e04-4c15"}, {"nodeId": "733", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] and soft actor-critic (SAC) [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] and soft actor-critic (SAC) ["}}]}, "properties": [], "parentId": "253", "childIds": [], "backendDOMNodeId": 848}, {"nodeId": "734", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "45", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "45"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "253", "childIds": ["1828"], "backendDOMNodeId": 849, "browsergym_id": "c038ca91-d8e9-4561"}, {"nodeId": "735", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. First, the general terms and concepts are presented in Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. First, the general terms and concepts are presented in Section "}}]}, "properties": [], "parentId": "253", "childIds": [], "backendDOMNodeId": 851}, {"nodeId": "736", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "253", "childIds": ["1829"], "backendDOMNodeId": 852, "browsergym_id": "dd764781-091f-4810"}, {"nodeId": "737", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". The optimization methods of reinforcement learning for policies are generally divided into Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". The optimization methods of reinforcement learning for policies are generally divided into Section "}}]}, "properties": [], "parentId": "253", "childIds": [], "backendDOMNodeId": 854}, {"nodeId": "738", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "253", "childIds": ["1830"], "backendDOMNodeId": 855, "browsergym_id": "bf8d3a4e-3cb8-46d6"}, {"nodeId": "739", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " and Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " and Section "}}]}, "properties": [], "parentId": "253", "childIds": [], "backendDOMNodeId": 857}, {"nodeId": "740", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "253", "childIds": ["1831"], "backendDOMNodeId": 858, "browsergym_id": "ec8925bf-e7c0-4baa"}, {"nodeId": "741", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". Either of the two methods has the ability to find the optimal control strategy. Still, their respective shortcomings must be addressed, like a relatively large gradient variance in policy method, etc. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". Either of the two methods has the ability to find the optimal control strategy. Still, their respective shortcomings must be addressed, like a relatively large gradient variance in policy method, etc. ["}}]}, "properties": [], "parentId": "253", "childIds": [], "backendDOMNodeId": 860}, {"nodeId": "742", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "46", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "46"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "253", "childIds": ["1832"], "backendDOMNodeId": 861, "browsergym_id": "ccab3085-3436-40fd"}, {"nodeId": "743", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. The actor-critic method discussed in Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. 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The values of states rely on the values of some other states or themselves, which is related to an important concept called bootstrapping.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " represents the system dynamic. The values of states rely on the values of some other states or themselves, which is related to an important concept called bootstrapping."}}]}, "properties": [], "parentId": "276", "childIds": [], "backendDOMNodeId": 2876}, {"nodeId": "901", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Since state values can be used to evaluate policies, they can also define optimal policies. If ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Since state values can be used to evaluate policies, they can also define optimal policies. 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The solution to the BOE always exists as the unique optimal state value, which is the greatest state value that can be achieved by any initial policy [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "It is a nonlinear equation with a nice contraction property, and the contraction mapping theorem is applied to prove its convergence. 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{"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "].", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]."}}]}, "properties": [], "parentId": "279", "childIds": [], "backendDOMNodeId": 3188}, {"nodeId": "924", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Similarly, the Bellman equation and Bellman optimality equation have expressions in terms of state-action values as", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Similarly, the Bellman equation and Bellman optimality equation have expressions in terms of state-action values as"}}]}, "properties": [], "parentId": "280", "childIds": [], "backendDOMNodeId": 3190}, {"nodeId": "925", "ignored": true, "ignoredReasons": [{"name": "notRendered", "value": {"type": "boolean", "value": true}}], "role": {"type": "role", 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[{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents"}, {"type": "attribute", "attribute": "title"}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "283", "childIds": ["1941", "1943"], "backendDOMNodeId": 3537}, {"nodeId": "931", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "283", "childIds": [], "backendDOMNodeId": 3896, "browsergym_id": "bcb18844-1f64-4e0b"}, {"nodeId": "932", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In practice, the state-action value plays a more direct role than the state value when attempting to find optimal policies. The Bellman optimality equation is a particular form of the Bellman equation. The corresponding state value is the optimal state value, and the related implicit optimal policy can be drawn from the greatest values. For example, the optimal policy ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In practice, the state-action value plays a more direct role than the state value when attempting to find optimal policies. The Bellman optimality equation is a particular form of the Bellman equation. The corresponding state value is the optimal state value, and the related implicit optimal policy can be drawn from the greatest values. For example, the optimal policy "}}]}, "properties": [], "parentId": "284", "childIds": [], "backendDOMNodeId": 3898}, {"nodeId": "933", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "284", "childIds": ["1944"], "backendDOMNodeId": 3899, "browsergym_id": "09f53028-9a0f-4280"}, {"nodeId": "934", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "* is calculated by using an optimization procedure over the value function:", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "* is calculated by using an optimization procedure over the value function:"}}]}, "properties": [], "parentId": "284", "childIds": [], "backendDOMNodeId": 3901}, {"nodeId": "935", "ignored": true, "ignoredReasons": [{"name": "notRendered", "value": {"type": "boolean", "value": true}}], "role": {"type": "role", "value": "none"}, "chromeRole": {"type": "internalRole", "value": 0}, "parentId": "285", "childIds": [], "backendDOMNodeId": 3903}, {"nodeId": "936", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents"}, {"type": "attribute", "attribute": "title"}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "285", "childIds": ["1945", "1947"], "backendDOMNodeId": 3904}, {"nodeId": "937", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "285", "childIds": [], "backendDOMNodeId": 4034, "browsergym_id": "ddcbc9e2-014b-442e"}, {"nodeId": "938", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Policy-Based Methods", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Policy-Based Methods"}}]}, "properties": [], "parentId": "287", "childIds": [], "backendDOMNodeId": 4037}, {"nodeId": "939", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The value-based methods use value functions and no explicit functions for the policy. And the policy-based methods, such as REINFORCE [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The value-based methods use value functions and no explicit functions for the policy. 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Assuming that the policy is represented by a parameterized function denoted as ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " directly over the parameter space. 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The purpose of replay buffer and target value network techniques in Deep Q-learning Network ["}}]}, "properties": [], "parentId": "300", "childIds": [], "backendDOMNodeId": 5512}, {"nodeId": "1008", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "26", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "26"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "300", "childIds": ["1990"], "backendDOMNodeId": 5513, "browsergym_id": "e9527773-adc8-499a"}, {"nodeId": "1009", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "300", "childIds": [], "backendDOMNodeId": 5515}, {"nodeId": "1010", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "55", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "55"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "300", "childIds": ["1991"], "backendDOMNodeId": 5516, "browsergym_id": "07c2f2f8-e3b3-4cac"}, {"nodeId": "1011", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] algorithm ameliorate the above situation well, which achieves significant progress in Atari games. Besides, value-based methods must resort to an optimization procedure in every state encountered to find the action leading to an optimal value, which can be computationally expensive for continuous state and action spaces.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] algorithm ameliorate the above situation well, which achieves significant progress in Atari games. Besides, value-based methods must resort to an optimization procedure in every state encountered to find the action leading to an optimal value, which can be computationally expensive for continuous state and action spaces."}}]}, "properties": [], "parentId": "300", "childIds": [], "backendDOMNodeId": 5518}, {"nodeId": "1012", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Policy-based methods work with a parameterized family of policies and optimize the objective function directly over the parameter space of the policy. 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However, a possible drawback is that the gradient estimation may have a significant variance due to the randomness of reward over time [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. However, a possible drawback is that the gradient estimation may have a significant variance due to the randomness of reward over time ["}}]}, "properties": [], "parentId": "301", "childIds": [], "backendDOMNodeId": 5523}, {"nodeId": "1015", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "56", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "56"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "301", "childIds": ["1993"], "backendDOMNodeId": 5524, "browsergym_id": "a22ccf70-5fc0-4155"}, {"nodeId": "1016", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "301", "childIds": [], "backendDOMNodeId": 5526}, {"nodeId": "1017", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "57", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "57"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "301", "childIds": ["1994"], "backendDOMNodeId": 5527, "browsergym_id": "8de80a51-fd94-463f"}, {"nodeId": "1018", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Furthermore, as the policy changes, a new gradient is estimated independently of past estimates. Hence, there is no \u201dlearning\u201d in accumulating and consolidating older information.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Furthermore, as the policy changes, a new gradient is estimated independently of past estimates. 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A parameterized function is proposed based on the value-based methods to learn state value ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. A parameterized function is proposed based on the value-based methods to learn state value "}}]}, "properties": [], "parentId": "302", "childIds": [], "backendDOMNodeId": 5537}, {"nodeId": "1024", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "302", "childIds": ["1997"], "backendDOMNodeId": 5538, "browsergym_id": "9c005035-4dad-401d"}, {"nodeId": "1025", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " or state-action value ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " or state-action value "}}]}, "properties": [], "parentId": "302", "childIds": [], "backendDOMNodeId": 5540}, {"nodeId": "1026", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "302", "childIds": ["1998"], "backendDOMNodeId": 5541, "browsergym_id": "532b4cf3-62c4-4605"}, {"nodeId": "1027", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " as a critic. And the policy is not inferred from the value function. It uses a parameterized function as actor ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " as a critic. And the policy is not inferred from the value function. It uses a parameterized function as actor "}}]}, "properties": [], "parentId": "302", "childIds": [], "backendDOMNodeId": 5543}, {"nodeId": "1028", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "302", "childIds": ["1999"], "backendDOMNodeId": 5544, "browsergym_id": "2965d810-1d39-4e84"}, {"nodeId": "1029", "ignored": false, "role": {"type": "role", "value": "subscript"}, "chromeRole": {"type": "internalRole", "value": 185}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "302", "childIds": ["2000"], "backendDOMNodeId": 5546, "browsergym_id": "0160f705-fd4c-4461"}, {"nodeId": "1030", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", which has good convergence properties in contrast with value-based methods and brings the advantage of computing continuous actions without the need for optimization procedures on a value function. At the same time, the critic supplies the actor with low-variance value knowledge ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", which has good convergence properties in contrast with value-based methods and brings the advantage of computing continuous actions without the need for optimization procedures on a value function. 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The agent consists of the critic and actor parts, which interact with the environment as presented in Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " shows the schematic structure of actor-critic methods. The agent consists of the critic and actor parts, which interact with the environment as presented in Section "}}]}, "properties": [], "parentId": "303", "childIds": [], "backendDOMNodeId": 5702}, {"nodeId": "1037", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "303", "childIds": ["2006"], "backendDOMNodeId": 5703, "browsergym_id": "96f90375-f255-4a8e"}, {"nodeId": "1038", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". During the collection of rewards, the critic is responsible for estimating value functions with parameterized function approximators like deep neural networks. The actor-critic methods often follow the idea of the bootstrap method to evaluate value function, whose objective function on state-action value is", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". During the collection of rewards, the critic is responsible for estimating value functions with parameterized function approximators like deep neural networks. 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The actor-critic methods are the improvement of the policy-based methods in reducing the sample variance or the expansion of the value-based method in the continuous state-action space problem. Compared to value-based or policy-based methods, the actor-critic method shows many friendly properties, a popular template for researchers developing more advanced algorithms.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], is proposed to improve the efficiency of the algorithm. The actor-critic methods are the improvement of the policy-based methods in reducing the sample variance or the expansion of the value-based method in the continuous state-action space problem. Compared to value-based or policy-based methods, the actor-critic method shows many friendly properties, a popular template for researchers developing more advanced algorithms."}}]}, "properties": [], "parentId": "315", "childIds": [], "backendDOMNodeId": 7219}, {"nodeId": "1064", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Advanced Deep Reinforcement Learning Algorithms", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Advanced Deep Reinforcement Learning Algorithms"}}]}, "properties": [], "parentId": "316", "childIds": [], "backendDOMNodeId": 7221}, {"nodeId": "1065", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "With the deepening of research, many advanced deep reinforcement learning algorithms on 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This section presents Proximal Policy Optimization (PPO) algorithm and Soft Actor-Critic (SAC) algorithm. Considering the length of the article, a brief introduction is given. For more details and principles, interested readers are suggested to refer to the original papers [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] and so on. This section presents Proximal Policy Optimization (PPO) algorithm and Soft Actor-Critic (SAC) algorithm. Considering the length of the article, a brief introduction is given. For more details and principles, interested readers are suggested to refer to the original papers ["}}]}, "properties": [], "parentId": "317", "childIds": [], "backendDOMNodeId": 7235}, {"nodeId": "1074", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "44", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "44"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "317", "childIds": ["2030"], "backendDOMNodeId": 7236, "browsergym_id": "08587a3d-8c65-4252"}, {"nodeId": "1075", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "317", "childIds": [], "backendDOMNodeId": 7238}, {"nodeId": "1076", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "45", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "45"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "317", "childIds": ["2031"], "backendDOMNodeId": 7239, "browsergym_id": "e0290322-7512-4926"}, {"nodeId": "1077", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "].", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]."}}]}, "properties": [], "parentId": "317", "childIds": [], "backendDOMNodeId": 7241}, {"nodeId": "1078", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Proximal Policy Optimization (PPO)", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Proximal Policy Optimization (PPO)"}}]}, "properties": [], "parentId": "318", "childIds": [], "backendDOMNodeId": 7243}, {"nodeId": "1079", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Proximal policy optimization (PPO) is a robust on-policy policy gradient method for reinforcement learning proposed by OpenAI [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Proximal policy optimization (PPO) is a robust on-policy policy gradient method for reinforcement learning proposed by OpenAI ["}}]}, "properties": [], "parentId": "319", "childIds": [], "backendDOMNodeId": 7245}, {"nodeId": "1080", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "44", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "44"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "319", "childIds": ["2032"], "backendDOMNodeId": 7246, "browsergym_id": "c4d6c3e8-4ff1-43d7"}, {"nodeId": "1081", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Standard policy gradient methods perform one gradient update per data sampling. Still, PPO utilizes a novel objective function that enables multiple epochs of minibatch updates by importance sampling trick, which improves sample efficiency.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Standard policy gradient methods perform one gradient update per data sampling. Still, PPO utilizes a novel objective function that enables multiple epochs of minibatch updates by importance sampling trick, which improves sample efficiency."}}]}, "properties": [], "parentId": "319", "childIds": [], "backendDOMNodeId": 7248}, {"nodeId": "1082", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Typical trust-region methods constrain policy updates to a trust region, ensuring that the entire policy update process is monotonous. 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But it is much simpler to implement, requiring only a few lines of code change to a vanilla policy gradient (VPG) implementation ["}}]}, "properties": [], "parentId": "323", "childIds": [], "backendDOMNodeId": 7796}, {"nodeId": "1121", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "47", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "47"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "323", "childIds": ["2057"], "backendDOMNodeId": 7797, "browsergym_id": "c93a1c5c-d473-45e2"}, {"nodeId": "1122", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], which is applicable in general settings and has better overall performance.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], which is applicable in general settings and has better overall performance."}}]}, "properties": [], "parentId": "323", "childIds": [], "backendDOMNodeId": 7799}, {"nodeId": "1123", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Soft Actor-Critic (SAC)", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Soft Actor-Critic (SAC)"}}]}, "properties": [], "parentId": "324", "childIds": [], "backendDOMNodeId": 7801}, {"nodeId": "1124", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Soft Actor-critic is an off-policy actor-critic deep RL algorithm based on the maximum entropy reinforcement learning framework [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Soft Actor-critic is an off-policy actor-critic deep RL algorithm based on the maximum entropy reinforcement learning framework ["}}]}, "properties": [], "parentId": "325", "childIds": [], "backendDOMNodeId": 7803}, {"nodeId": "1125", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "45", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "45"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "325", "childIds": ["2058"], "backendDOMNodeId": 7804, "browsergym_id": "1da7e5ca-95db-415a"}, {"nodeId": "1126", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. In this framework, the actor aims to maximize the standard ultimate reward while also maximizing entropy. Maximum entropy reinforcement learning alters the RL objective [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. In this framework, the actor aims to maximize the standard ultimate reward while also maximizing entropy. Maximum entropy reinforcement learning alters the RL objective ["}}]}, "properties": [], "parentId": "325", "childIds": [], "backendDOMNodeId": 7806}, {"nodeId": "1127", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "62", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "62"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "325", "childIds": ["2059"], "backendDOMNodeId": 7807, "browsergym_id": "b4c4f726-af34-4b8d"}, {"nodeId": "1128", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], though the original aim can be recovered using a temperature parameter. More importantly, the maximum entropy formulation substantially improves exploration and robustness: maximum entropy policies are robust in the face of model and estimation errors, and they enhance exploration by acquiring diverse behaviors [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], though the original aim can be recovered using a temperature parameter. More importantly, the maximum entropy formulation substantially improves exploration and robustness: maximum entropy policies are robust in the face of model and estimation errors, and they enhance exploration by acquiring diverse behaviors ["}}]}, "properties": [], "parentId": "325", "childIds": [], "backendDOMNodeId": 7809}, {"nodeId": "1129", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "45", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "45"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "325", "childIds": ["2060"], "backendDOMNodeId": 7810, "browsergym_id": "69c563ae-d610-445c"}, {"nodeId": "1130", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "].", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]."}}]}, "properties": [], "parentId": "325", "childIds": [], "backendDOMNodeId": 7812}, {"nodeId": "1131", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "The maximum entropy objective (see, e.g., (Ziebart, 2010) generalizes the standard objective by augmenting it with an entropy term, such that the optimal policy additionally aims to maximize its entropy at each visited state:", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "The maximum entropy objective (see, e.g., (Ziebart, 2010) generalizes the standard objective by augmenting it with an entropy term, such that the optimal policy additionally aims to maximize its entropy at each visited state:"}}]}, "properties": [], "parentId": "326", "childIds": [], "backendDOMNodeId": 7814}, {"nodeId": "1132", "ignored": true, "ignoredReasons": [{"name": "notRendered", "value": {"type": "boolean", "value": true}}], "role": {"type": "role", "value": "none"}, "chromeRole": {"type": "internalRole", "value": 0}, "parentId": "327", "childIds": [], "backendDOMNodeId": 7816}, {"nodeId": "1133", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents"}, {"type": "attribute", "attribute": "title"}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "327", "childIds": ["2061", "2063"], "backendDOMNodeId": 7817}, {"nodeId": "1134", "ignored": false, "role": {"type": "role", "value": "generic"}, "chromeRole": {"type": "internalRole", "value": 88}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "327", "childIds": [], "backendDOMNodeId": 8181, "browsergym_id": "de338ca6-3eac-4c08"}, {"nodeId": "1135", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "where ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "where "}}]}, "properties": [], "parentId": "328", "childIds": [], "backendDOMNodeId": 8183}, {"nodeId": "1136", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "328", "childIds": ["2064"], "backendDOMNodeId": 8184, "browsergym_id": "0ecb6fa2-3b09-44d8"}, {"nodeId": "1137", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " is the temperature parameter determining the relative importance of the entropy term against the reward. 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[", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In Ref. 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And the real-world experiments indicated that soft actor-critic was robust and sample efficient enough for robotic tasks learned directly in the real world, such as locomotion and dexterous manipulation.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], it empirically showed that it matched or exceeded the performance of state-of-the-art model-free deep RL methods, including the off-policy TD3 algorithm and the on-policy PPO algorithm without any environment-specific hyperparameter tuning. And the real-world experiments indicated that soft actor-critic was robust and sample efficient enough for robotic tasks learned directly in the real world, such as locomotion and dexterous manipulation."}}]}, "properties": [], "parentId": "329", "childIds": [], "backendDOMNodeId": 8197}, {"nodeId": "1145", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Applications of DRL-Based Active Flow Control", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Applications of DRL-Based Active Flow Control"}}]}, "properties": [], "parentId": "331", "childIds": [], "backendDOMNodeId": 8200}, {"nodeId": "1146", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "For DRL-based active flow control, it is essential to construct a Markov Decision Process (MDP) from the flow phenomenon. If the state of flow and the reward of actions are well-selected, the reinforcement learning technique can solve the Bellman equation with high proficiency. Moreover, the artificial neural network applied to the above deep reinforcement learning algorithms has good approximation ability in high-dimensional space with less complexity than typical polynomial fitting. It has proven its advantages in many flow applications like prediction.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "For DRL-based active flow control, it is essential to construct a Markov Decision Process (MDP) from the flow phenomenon. If the state of flow and the reward of actions are well-selected, the reinforcement learning technique can solve the Bellman equation with high proficiency. Moreover, the artificial neural network applied to the above deep reinforcement learning algorithms has good approximation ability in high-dimensional space with less complexity than typical polynomial fitting. It has proven its advantages in many flow applications like prediction."}}]}, "properties": [], "parentId": "332", "childIds": [], "backendDOMNodeId": 8202}, {"nodeId": "1147", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In the past 6\u00a0years, we have also seen many efforts to introduce deep reinforcement learning into the flow control field. From the initial tabular, e.g., Q-learning, to advanced deep learning, like Soft Actor-Critic (SAC) and Proximal Policy Optimization (PPO), DRL algorithms are equipped more smartly, and novel control phenomena have been explored. This section reviews recent flow control applications based on deep reinforcement learning, including Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In the past 6\u00a0years, we have also seen many efforts to introduce deep reinforcement learning into the flow control field. From the initial tabular, e.g., Q-learning, to advanced deep learning, like Soft Actor-Critic (SAC) and Proximal Policy Optimization (PPO), DRL algorithms are equipped more smartly, and novel control phenomena have been explored. This section reviews recent flow control applications based on deep reinforcement learning, including Section "}}]}, "properties": [], "parentId": "333", "childIds": [], "backendDOMNodeId": 8204}, {"nodeId": "1148", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "333", "childIds": ["2068"], "backendDOMNodeId": 8205, "browsergym_id": "a9db81f1-2cd4-48e1"}, {"nodeId": "1149", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", Section "}}]}, "properties": [], "parentId": "333", "childIds": [], "backendDOMNodeId": 8207}, {"nodeId": "1150", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "333", "childIds": ["2069"], "backendDOMNodeId": 8208, "browsergym_id": "9c9bd8ab-b967-49d3"}, {"nodeId": "1151", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", Section "}}]}, "properties": [], "parentId": "333", "childIds": [], "backendDOMNodeId": 8210}, {"nodeId": "1152", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "333", "childIds": ["2070"], "backendDOMNodeId": 8211, "browsergym_id": "219c6be4-97af-4f99"}, {"nodeId": "1153", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", and Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", and Section "}}]}, "properties": [], "parentId": "333", "childIds": [], "backendDOMNodeId": 8213}, {"nodeId": "1154", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "333", "childIds": ["2071"], "backendDOMNodeId": 8214, "browsergym_id": "b352f7f6-83e5-4c6b"}, {"nodeId": "1155", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". 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The flow around a circular cylinder can be considered a prototype of the bluff body wakes, which is involved with various instability. In the cylinder wake, the transition from steady to periodic flow is marked by a Hopf bifurcation with critical Reynolds Re = 47, which is known as the first instability [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. The flow around a circular cylinder can be considered a prototype of the bluff body wakes, which is involved with various instability. In the cylinder wake, the transition from steady to periodic flow is marked by a Hopf bifurcation with critical Reynolds Re = 47, which is known as the first instability ["}}]}, "properties": [], "parentId": "340", "childIds": [], "backendDOMNodeId": 8241}, {"nodeId": "1167", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "88", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "88"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "340", "childIds": ["2078"], "backendDOMNodeId": 8242, "browsergym_id": "865ad0f7-7d80-41dd"}, {"nodeId": "1168", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Three-dimensional fluctuations for higher Reynolds numbers further superimpose this vortex shedding. The onset of three-dimensionality occurs at the critical Reynolds number of Re = 175. These periodic behaviors can induce fluctuating hydrodynamic force on the bluff body, leading to vortex-induced vibrations, which can bring the challenge to structural fatigue performance or provide an opportunity for energy utilization [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Three-dimensional fluctuations for higher Reynolds numbers further superimpose this vortex shedding. The onset of three-dimensionality occurs at the critical Reynolds number of Re = 175. These periodic behaviors can induce fluctuating hydrodynamic force on the bluff body, leading to vortex-induced vibrations, which can bring the challenge to structural fatigue performance or provide an opportunity for energy utilization ["}}]}, "properties": [], "parentId": "340", "childIds": [], "backendDOMNodeId": 8244}, {"nodeId": "1169", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "89", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "89"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "340", "childIds": ["2079"], "backendDOMNodeId": 8245, "browsergym_id": "5e786078-7f44-4dc0"}, {"nodeId": "1170", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", "}}]}, "properties": [], "parentId": "340", "childIds": [], "backendDOMNodeId": 8247}, {"nodeId": "1171", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "90", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "90"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "340", "childIds": ["2080"], "backendDOMNodeId": 8248, "browsergym_id": "b4e30d92-1efb-4a12"}, {"nodeId": "1172", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "].", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]."}}]}, "properties": [], "parentId": "340", "childIds": [], "backendDOMNodeId": 8250}, {"nodeId": "1173", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As early as 2018, Koizumi et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As early as 2018, Koizumi et al. ["}}]}, "properties": [], "parentId": "341", "childIds": [], "backendDOMNodeId": 8252}, {"nodeId": "1174", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "63", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "63"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "341", "childIds": ["2081"], "backendDOMNodeId": 8253, "browsergym_id": "db019074-8983-4011"}, {"nodeId": "1175", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] applied a deep deterministic policy gradient (DDPG) algorithm to control the Karman vortex shedding from a fixed cylinder. Compared with conventional model-based feedback control, the result of the DDPG also shows better control performance with reduced lift. Later on, for the vortex-induced vibrations, some scholars have also tried deep reinforcement learning to eliminate them. By constructing a spring-mounted cylinder model, Zheng et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] applied a deep deterministic policy gradient (DDPG) algorithm to control the Karman vortex shedding from a fixed cylinder. Compared with conventional model-based feedback control, the result of the DDPG also shows better control performance with reduced lift. Later on, for the vortex-induced vibrations, some scholars have also tried deep reinforcement learning to eliminate them. By constructing a spring-mounted cylinder model, Zheng et al. ["}}]}, "properties": [], "parentId": "341", "childIds": [], "backendDOMNodeId": 8255}, {"nodeId": "1176", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "37", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "37"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "341", "childIds": ["2082"], "backendDOMNodeId": 8256, "browsergym_id": "e6083f0a-1189-49e2"}, {"nodeId": "1177", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] proposed a deep reinforcement learning active flow control framework to suppress the vortex-induced vibration of a cylinder immersed in uniform flow by a pair of jets placed on the poles of the cylinder as actuators. In training, the SAC agent is fed with a lift-oriented reward, which successfully reduces the maximum vibration amplitude by 81%. Ren et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] proposed a deep reinforcement learning active flow control framework to suppress the vortex-induced vibration of a cylinder immersed in uniform flow by a pair of jets placed on the poles of the cylinder as actuators. In training, the SAC agent is fed with a lift-oriented reward, which successfully reduces the maximum vibration amplitude by 81%. Ren et al. ["}}]}, "properties": [], "parentId": "341", "childIds": [], "backendDOMNodeId": 8258}, {"nodeId": "1178", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "64", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "64"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "341", "childIds": ["2083"], "backendDOMNodeId": 8259, "browsergym_id": "eb5e40fa-2644-4106"}, {"nodeId": "1179", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] further adopted windward-suction-leeward-blowing (WSLB) actuators to control the wake of an elastically mounted cylinder. They encoded velocity information in the VIV wake into the reward function of reinforcement learning, aiming at keeping pace with the stable flow. Only a 0.29% deficit in streamwise velocity is detected, which is a 99.5% reduction from the uncontrolled value, and the learning process is shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] further adopted windward-suction-leeward-blowing (WSLB) actuators to control the wake of an elastically mounted cylinder. They encoded velocity information in the VIV wake into the reward function of reinforcement learning, aiming at keeping pace with the stable flow. Only a 0.29% deficit in streamwise velocity is detected, which is a 99.5% reduction from the uncontrolled value, and the learning process is shown in "}}]}, "properties": [], "parentId": "341", "childIds": [], "backendDOMNodeId": 8261}, {"nodeId": "1180", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 5", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 5"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "341", "childIds": ["2084"], "backendDOMNodeId": 8262, "browsergym_id": "bff62c13-2286-4641"}, {"nodeId": "1181", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". Unlike the previous two cases, instead of reducing the intensity of the vortex shedding caused by the first instability, the essence of reinforcement learning flow control in Ren\u2019s work is to eliminate the vortex shedding caused by the first instability, which is the origin of the vortex-induced vibrations.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". Unlike the previous two cases, instead of reducing the intensity of the vortex shedding caused by the first instability, the essence of reinforcement learning flow control in Ren\u2019s work is to eliminate the vortex shedding caused by the first instability, which is the origin of the vortex-induced vibrations."}}]}, "properties": [], "parentId": "341", "childIds": [], "backendDOMNodeId": 8264}, {"nodeId": "1182", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 5", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 5"}}]}, "properties": [], "parentId": "343", "childIds": [], "backendDOMNodeId": 8267}, {"nodeId": "1183", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "344", "childIds": ["2085"], "backendDOMNodeId": 8269, "browsergym_id": "e8e4c68e-4968-4c2c"}, {"nodeId": "1184", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "344", "childIds": ["2086", "2087", "2088", "2089"], "backendDOMNodeId": 8271, "browsergym_id": "cf15ef1a-8741-470c"}, {"nodeId": "1185", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "For the energy utilization of vortex-induced vibration, Mei et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "For the energy utilization of vortex-induced vibration, Mei et al. ["}}]}, "properties": [], "parentId": "347", "childIds": [], "backendDOMNodeId": 8281}, {"nodeId": "1186", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "65", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "65"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "347", "childIds": ["2090"], "backendDOMNodeId": 8282, "browsergym_id": "c4b2c179-33b6-4a58"}, {"nodeId": "1187", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] proved that the performance of the active jet control strategy established by DRL for enhancing VIV is outstanding and promising. It is shown that the ANN can successfully increase the drag by 30.78% and the magnitude of fluctuation of drag and lift coefficient by 785.71% and 139.62%, respectively. Furthermore, the net energy output by VIV with jet control increased by 357.63% (case of water) compared with the uncontrolled situation.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] proved that the performance of the active jet control strategy established by DRL for enhancing VIV is outstanding and promising. It is shown that the ANN can successfully increase the drag by 30.78% and the magnitude of fluctuation of drag and lift coefficient by 785.71% and 139.62%, respectively. Furthermore, the net energy output by VIV with jet control increased by 357.63% (case of water) compared with the uncontrolled situation."}}]}, "properties": [], "parentId": "347", "childIds": [], "backendDOMNodeId": 8284}, {"nodeId": "1188", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Hydrodynamic Drag", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Hydrodynamic Drag"}}]}, "properties": [], "parentId": "348", "childIds": [], "backendDOMNodeId": 8286}, {"nodeId": "1189", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In terms of hydrodynamic drag, it is the primary concern for modern hydrodynamic design. Namely, the potential benefits of an effective closed-loop active flow control for drag are highlighted for energy and transportation.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In terms of hydrodynamic drag, it is the primary concern for modern hydrodynamic design. Namely, the potential benefits of an effective closed-loop active flow control for drag are highlighted for energy and transportation."}}]}, "properties": [], "parentId": "349", "childIds": [], "backendDOMNodeId": 8288}, {"nodeId": "1190", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Like the flow stability topic, the early active flow control applications of reinforcement learning are within the deep neural network. Pivot and Mathelin [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Like the flow stability topic, the early active flow control applications of reinforcement learning are within the deep neural network. Pivot and Mathelin ["}}]}, "properties": [], "parentId": "350", "childIds": [], "backendDOMNodeId": 8290}, {"nodeId": "1191", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "66", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "66"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "350", "childIds": ["2091"], "backendDOMNodeId": 8291, "browsergym_id": "cee1bda0-bbb8-4a49"}, {"nodeId": "1192", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] proposed a reinforcement learning active flow control framework whose value function and policy function are approximated with local linear models. Taking embedding and delayed effect of the action into consideration, the system\u2019s state is constructed carefully, and 17% of cylinder drag reduction is obtained by RL-controlled self-rotating. Then the artificial neural network technique is introduced into the field of active flow control on reducing hydrodynamics drag, which replaces the original way by using elaborately-designed state representation for the flow system. Rabault [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] proposed a reinforcement learning active flow control framework whose value function and policy function are approximated with local linear models. Taking embedding and delayed effect of the action into consideration, the system\u2019s state is constructed carefully, and 17% of cylinder drag reduction is obtained by RL-controlled self-rotating. Then the artificial neural network technique is introduced into the field of active flow control on reducing hydrodynamics drag, which replaces the original way by using elaborately-designed state representation for the flow system. Rabault ["}}]}, "properties": [], "parentId": "350", "childIds": [], "backendDOMNodeId": 8293}, {"nodeId": "1193", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "67", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "67"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "350", "childIds": ["2092"], "backendDOMNodeId": 8294, "browsergym_id": "1058b014-74e3-4bb7"}, {"nodeId": "1194", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] was the first scholar to apply an artificial neural network trained through a deep reinforcement learning agent to perform active flow control for cylinder drag reduction. At Reynolds number of Re = 100, the drag can be reduced by approximately 8% shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] was the first scholar to apply an artificial neural network trained through a deep reinforcement learning agent to perform active flow control for cylinder drag reduction. At Reynolds number of Re = 100, the drag can be reduced by approximately 8% shown in "}}]}, "properties": [], "parentId": "350", "childIds": [], "backendDOMNodeId": 8296}, {"nodeId": "1195", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 6", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 6"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "350", "childIds": ["2093"], "backendDOMNodeId": 8297, "browsergym_id": "3c88cb5f-e20e-49f7"}, {"nodeId": "1196", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". It was seen that the circulation area is dramatically increased, and the fluctuation of vortex shedding is reduced. Their forward-looking work provided a template for DRL-based active flow control in the fluid mechanics. Qin [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". It was seen that the circulation area is dramatically increased, and the fluctuation of vortex shedding is reduced. Their forward-looking work provided a template for DRL-based active flow control in the fluid mechanics. Qin ["}}]}, "properties": [], "parentId": "350", "childIds": [], "backendDOMNodeId": 8299}, {"nodeId": "1197", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "68", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "68"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "350", "childIds": ["2094"], "backendDOMNodeId": 8300, "browsergym_id": "f8e4f31c-06a7-4045"}, {"nodeId": "1198", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] modified the reward function with dynamic mode decomposition (DMD). With the data-driven reward, the DRL model can learn the AFC policy through the more global information of the field and the learning was improved. Xu [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] modified the reward function with dynamic mode decomposition (DMD). With the data-driven reward, the DRL model can learn the AFC policy through the more global information of the field and the learning was improved. Xu ["}}]}, "properties": [], "parentId": "350", "childIds": [], "backendDOMNodeId": 8302}, {"nodeId": "1199", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "69", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "69"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "350", "childIds": ["2095"], "backendDOMNodeId": 8303, "browsergym_id": "dfc1b92f-5edf-4bae"}, {"nodeId": "1200", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] used DRL to control small rotating cylinders on the back of the controlled cylinder and achieved drag reduction, which successfully illustrated the adaptability of DRL to actuators in AFC problems.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] used DRL to control small rotating cylinders on the back of the controlled cylinder and achieved drag reduction, which successfully illustrated the adaptability of DRL to actuators in AFC problems."}}]}, "properties": [], "parentId": "350", "childIds": [], "backendDOMNodeId": 8305}, {"nodeId": "1201", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 6", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 6"}}]}, "properties": [], "parentId": "352", "childIds": [], "backendDOMNodeId": 8308}, {"nodeId": "1202", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "353", "childIds": ["2096"], "backendDOMNodeId": 8310, "browsergym_id": "14dbfffe-0f82-4e06"}, {"nodeId": "1203", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "353", "childIds": ["2097", "2098", "2099", "2100", "2101", "2102", "2103", "2104"], "backendDOMNodeId": 8312, "browsergym_id": "5bd7f95d-82f2-4377"}, {"nodeId": "1204", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "To investigate the generalization performance of DRL, Tang [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "To investigate the generalization performance of DRL, Tang ["}}]}, "properties": [], "parentId": "356", "childIds": [], "backendDOMNodeId": 8328}, {"nodeId": "1205", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "70", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "70"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "356", "childIds": ["2105"], "backendDOMNodeId": 8329, "browsergym_id": "54efb7bb-45bb-4bed"}, {"nodeId": "1206", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] trained a PPO agent in a learning environment supporting four flow configurations with Reynolds numbers of 100, 200, 300, and 400, which effectively reduced the drag for any previously unrecognized value of the Reynolds number between 60 and 400. Ren [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] trained a PPO agent in a learning environment supporting four flow configurations with Reynolds numbers of 100, 200, 300, and 400, which effectively reduced the drag for any previously unrecognized value of the Reynolds number between 60 and 400. Ren ["}}]}, "properties": [], "parentId": "356", "childIds": [], "backendDOMNodeId": 8331}, {"nodeId": "1207", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "71", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "71"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "356", "childIds": ["2106"], "backendDOMNodeId": 8332, "browsergym_id": "1e4f2063-f2e5-445f"}, {"nodeId": "1208", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] extended the flow condition to a weakly turbulent state with Re = 1,000 and proved that the PPO agent can still find effective control policies but requires much more episodes in the learning. For larger Reynolds numbers like 2000, Varela [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] extended the flow condition to a weakly turbulent state with Re = 1,000 and proved that the PPO agent can still find effective control policies but requires much more episodes in the learning. For larger Reynolds numbers like 2000, Varela ["}}]}, "properties": [], "parentId": "356", "childIds": [], "backendDOMNodeId": 8334}, {"nodeId": "1209", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "72", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "72"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "356", "childIds": ["2107"], "backendDOMNodeId": 8335, "browsergym_id": "8767613f-0a21-47c6"}, {"nodeId": "1210", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] finds significantly different forms of nature in the control strategies from those obtained at lower Re. More importantly, the cross applications of agents both from Re = 1000 and Re = 1000 were conducted in a flow with Re = 2000. Two similar results with different natures of control strategies may indicate that the Reynolds number regime (Re = 2000) belongs to a transition towards a nature-different flow which would only admit a high-frequency actuation strategy to obtain drag reduction. The deep insight is waiting for future simulations on higher Reynolds numbers.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] finds significantly different forms of nature in the control strategies from those obtained at lower Re. More importantly, the cross applications of agents both from Re = 1000 and Re = 1000 were conducted in a flow with Re = 2000. Two similar results with different natures of control strategies may indicate that the Reynolds number regime (Re = 2000) belongs to a transition towards a nature-different flow which would only admit a high-frequency actuation strategy to obtain drag reduction. The deep insight is waiting for future simulations on higher Reynolds numbers."}}]}, "properties": [], "parentId": "356", "childIds": [], "backendDOMNodeId": 8337}, {"nodeId": "1211", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Later on, Fan et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Later on, Fan et al. ["}}]}, "properties": [], "parentId": "357", "childIds": [], "backendDOMNodeId": 8339}, {"nodeId": "1212", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "73", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "73"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "357", "childIds": ["2108"], "backendDOMNodeId": 8340, "browsergym_id": "41eb867c-2df1-4fa5"}, {"nodeId": "1213", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] demonstrated the feasibility and effectiveness of reinforcement learning (RL) in bluff body flow control problems in simulations and experiments by automatically discovering active control strategies for drag reduction in turbulent flow with two small rotating cylinders. It is a crucial step to identify the limitations of the available hardware when applying reinforcement learning in a real-world experiment. After an automatic sequence of tens of towing experiments, the RL agent is shown to discover a control strategy comparable to the optimal policy found through lengthy, systematically planned control experiments. Meanwhile, the flow mechanism for the drag reduction was also explored. Through verification by three-dimensional simulations, as seen in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] demonstrated the feasibility and effectiveness of reinforcement learning (RL) in bluff body flow control problems in simulations and experiments by automatically discovering active control strategies for drag reduction in turbulent flow with two small rotating cylinders. It is a crucial step to identify the limitations of the available hardware when applying reinforcement learning in a real-world experiment. After an automatic sequence of tens of towing experiments, the RL agent is shown to discover a control strategy comparable to the optimal policy found through lengthy, systematically planned control experiments. Meanwhile, the flow mechanism for the drag reduction was also explored. Through verification by three-dimensional simulations, as seen in "}}]}, "properties": [], "parentId": "357", "childIds": [], "backendDOMNodeId": 8342}, {"nodeId": "1214", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 7", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 7"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "357", "childIds": ["2109"], "backendDOMNodeId": 8343, "browsergym_id": "aab34bba-47e9-41a5"}, {"nodeId": "1215", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", due to the gap between the large and small cylinders, a jet is informed within the hole, causing the change of flow topology in the cylinder wake. Therefore, compared to the non-rotating case, the pressure on the rear cylinder surface recovered to a negative value with a smaller magnitude, leading to a significant pressure drag reduction. Moreover, with the platform of a wind tunnel, Amico et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", due to the gap between the large and small cylinders, a jet is informed within the hole, causing the change of flow topology in the cylinder wake. Therefore, compared to the non-rotating case, the pressure on the rear cylinder surface recovered to a negative value with a smaller magnitude, leading to a significant pressure drag reduction. Moreover, with the platform of a wind tunnel, Amico et al. ["}}]}, "properties": [], "parentId": "357", "childIds": [], "backendDOMNodeId": 8345}, {"nodeId": "1216", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "74", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "74"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "357", "childIds": ["2110"], "backendDOMNodeId": 8346, "browsergym_id": "7181787b-adad-412d"}, {"nodeId": "1217", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] trained an agent capable of learning control laws for pulsed jets to manipulate the wake of a bluff body at Reynolds number Re = 10", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] trained an agent capable of learning control laws for pulsed jets to manipulate the wake of a bluff body at Reynolds number Re = 10"}}]}, "properties": [], "parentId": "357", "childIds": [], "backendDOMNodeId": 8348}, {"nodeId": "1218", "ignored": false, "role": {"type": "role", "value": "superscript"}, "chromeRole": {"type": "internalRole", "value": 186}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "357", "childIds": ["2111"], "backendDOMNodeId": 8349, "browsergym_id": "5e1f55ee-06c2-453d"}, {"nodeId": "1219", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". It is the first application of a single-step DRL in an experimental framework at large values of the Reynolds number to control the wake of a three-dimensional bluff body.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". It is the first application of a single-step DRL in an experimental framework at large values of the Reynolds number to control the wake of a three-dimensional bluff body."}}]}, "properties": [], "parentId": "357", "childIds": [], "backendDOMNodeId": 8351}, {"nodeId": "1220", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 7", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 7"}}]}, "properties": [], "parentId": "359", "childIds": [], "backendDOMNodeId": 8354}, {"nodeId": "1221", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "360", "childIds": ["2112"], "backendDOMNodeId": 8356, "browsergym_id": "0cd38108-abed-4ed1"}, {"nodeId": "1222", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "360", "childIds": ["2113", "2114", "2115", "2116", "2117", "2118", "2119", "2120", "2121", "2122", "2123", "2124", "2125", "2126", "2127", "2128", "2129", "2130", "2131", "2132"], "backendDOMNodeId": 8358, "browsergym_id": "02117228-46b9-4689"}, {"nodeId": "1223", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Aerodynamic Performance", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Aerodynamic Performance"}}]}, "properties": [], "parentId": "363", "childIds": [], "backendDOMNodeId": 8392}, {"nodeId": "1224", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "To make aviation greener, many efforts have been made to improve aircraft\u2019s aerodynamic performance to design a more effective, environmentally friendly air transport system [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "To make aviation greener, many efforts have been made to improve aircraft\u2019s aerodynamic performance to design a more effective, environmentally friendly air transport system ["}}]}, "properties": [], "parentId": "364", "childIds": [], "backendDOMNodeId": 8394}, {"nodeId": "1225", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "91", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "91"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "364", "childIds": ["2133"], "backendDOMNodeId": 8395, "browsergym_id": "1431054c-87f9-4945"}, {"nodeId": "1226", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "]. Active flow control technology can potentially deliver breakthrough improvements in the aerodynamic performance of the aircraft, like enhanced lift; reduced drag; controlled instability; and reduced noise or delayed transition. This subsection will present recent studies on DRL-based active flow control for aerodynamic performance improvement.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Active flow control technology can potentially deliver breakthrough improvements in the aerodynamic performance of the aircraft, like enhanced lift; reduced drag; controlled instability; and reduced noise or delayed transition. This subsection will present recent studies on DRL-based active flow control for aerodynamic performance improvement."}}]}, "properties": [], "parentId": "364", "childIds": [], "backendDOMNodeId": 8397}, {"nodeId": "1227", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Several scholars have applied reinforcement algorithms to achieve effective active flow strategies through numerical simulations or wind tunnel experiments to enhance lift and reduce drag. Wang [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Several scholars have applied reinforcement algorithms to achieve effective active flow strategies through numerical simulations or wind tunnel experiments to enhance lift and reduce drag. Wang ["}}]}, "properties": [], "parentId": "365", "childIds": [], "backendDOMNodeId": 8399}, {"nodeId": "1228", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "75", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "75"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "365", "childIds": ["2134"], "backendDOMNodeId": 8400, "browsergym_id": "9de1dc17-e948-48f9"}, {"nodeId": "1229", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] used the PPO algorithm on the synthetic jet control of flows over a NACA0012 airfoil at Re = 3,000 and embedded lift information into the reward function. The DRL agent can find a valid control policy with energy conservation by 83% under a combination of two different frequencies of inlet velocity. Guerra-Langan et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] used the PPO algorithm on the synthetic jet control of flows over a NACA0012 airfoil at Re = 3,000 and embedded lift information into the reward function. The DRL agent can find a valid control policy with energy conservation by 83% under a combination of two different frequencies of inlet velocity. Guerra-Langan et al. ["}}]}, "properties": [], "parentId": "365", "childIds": [], "backendDOMNodeId": 8402}, {"nodeId": "1230", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "76", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "76"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "365", "childIds": ["2135"], "backendDOMNodeId": 8403, "browsergym_id": "241f352e-de4b-41f3"}, {"nodeId": "1231", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] trained a series of reinforcement learning (RL) agents in simulation for lift coefficient control, then validated them in wind tunnel experiments. Specifically, an ANN aerodynamic coefficients estimator is trained to estimate lift and drag coefficients using pressure and strain sensor readings together with pitch rate. Results demonstrated that hybrid RL agents that use both distributed sensing data and conventional sensors performed best across the different tests.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] trained a series of reinforcement learning (RL) agents in simulation for lift coefficient control, then validated them in wind tunnel experiments. Specifically, an ANN aerodynamic coefficients estimator is trained to estimate lift and drag coefficients using pressure and strain sensor readings together with pitch rate. Results demonstrated that hybrid RL agents that use both distributed sensing data and conventional sensors performed best across the different tests."}}]}, "properties": [], "parentId": "365", "childIds": [], "backendDOMNodeId": 8405}, {"nodeId": "1232", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "To suppress or delay flow separation [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "To suppress or delay flow separation ["}}]}, "properties": [], "parentId": "366", "childIds": [], "backendDOMNodeId": 8407}, {"nodeId": "1233", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "92", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "92"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "366", "childIds": ["2136"], "backendDOMNodeId": 8408, "browsergym_id": "e1ae281f-34ba-41ed"}, {"nodeId": "1234", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], Shimomura and Sekimoto [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], Shimomura and Sekimoto ["}}]}, "properties": [], "parentId": "366", "childIds": [], "backendDOMNodeId": 8410}, {"nodeId": "1235", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "77", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "77"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "366", "childIds": ["2137"], "backendDOMNodeId": 8411, "browsergym_id": "3282d567-f2d9-4d66"}, {"nodeId": "1236", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] proposed a practical DRL-based flow separation control framework and investigated the plasma control effectiveness on a NACA0015 airfoil in a low-speed wind tunnel at a Reynolds number of 63000. As seen in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] proposed a practical DRL-based flow separation control framework and investigated the plasma control effectiveness on a NACA0015 airfoil in a low-speed wind tunnel at a Reynolds number of 63000. As seen in "}}]}, "properties": [], "parentId": "366", "childIds": [], "backendDOMNodeId": 8413}, {"nodeId": "1237", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 8", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 8"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "366", "childIds": ["2138"], "backendDOMNodeId": 8414, "browsergym_id": "42a56b87-8ae4-40e6"}, {"nodeId": "1238", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", based on deep Q-network(DQN), the closed-loop control keeps the flow attached and preserves it for a longer time by periodically switching the actuator on and off. With distributed executors and priority experience playback, they proved that the Ape-X DQN algorithm is more stable during training than the DQN algorithm in such plasma control problem [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", based on deep Q-network(DQN), the closed-loop control keeps the flow attached and preserves it for a longer time by periodically switching the actuator on and off. 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Moreover, Takada et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. Moreover, Takada et al. ["}}]}, "properties": [], "parentId": "366", "childIds": [], "backendDOMNodeId": 8419}, {"nodeId": "1241", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "79", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "79"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "366", "childIds": ["2140"], "backendDOMNodeId": 8420, "browsergym_id": "96d1824b-2fd8-4fac"}, {"nodeId": "1242", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] investigated the performance of plasma control on the NACA0012 airfoil in compressible fluid numerical simulation, which obtained the qualitative characteristics of the control policy [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] investigated the performance of plasma control on the NACA0012 airfoil in compressible fluid numerical simulation, which obtained the qualitative characteristics of the control policy ["}}]}, "properties": [], "parentId": "366", "childIds": [], "backendDOMNodeId": 8422}, {"nodeId": "1243", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "77", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "77"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": 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It is usually challenging to identify the internal mechanism of this adaptive pattern and generate corresponding behavior flow control strategies in another complex condition. Deep reinforcement learning has provided a new aspect to approach the goal.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. It is usually challenging to identify the internal mechanism of this adaptive pattern and generate corresponding behavior flow control strategies in another complex condition. Deep reinforcement learning has provided a new aspect to approach the goal."}}]}, "properties": [], "parentId": "373", "childIds": [], "backendDOMNodeId": 8450}, {"nodeId": "1254", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In the identification and reproduction of fish adaption behaviors in complex environments, Zhu et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In the identification and reproduction of fish adaption behaviors in complex environments, Zhu et al. ["}}]}, "properties": [], "parentId": "374", "childIds": [], "backendDOMNodeId": 8452}, {"nodeId": "1255", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "80", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "80"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "374", "childIds": ["2149"], "backendDOMNodeId": 8453, "browsergym_id": "8ce8131a-ecbf-483c"}, {"nodeId": "1256", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] utilized deep recurrent Q-network (DRQN) algorithm with immersed boundary\u2013lattice Boltzmann method to train the fish model and adapt its motion to optimally achieve a specific task, such as prey capture, rheotaxis and K\u00e1rm\u00e1n gaiting. Compared to existing learning models for fish, this work incorporated the fish position, velocity, and acceleration into the state space in the DRQN; it considered the amplitude and frequency action spaces and the historical effects. On the other hand, Mandralis et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] utilized deep recurrent Q-network (DRQN) algorithm with immersed boundary\u2013lattice Boltzmann method to train the fish model and adapt its motion to optimally achieve a specific task, such as prey capture, rheotaxis and K\u00e1rm\u00e1n gaiting. Compared to existing learning models for fish, this work incorporated the fish position, velocity, and acceleration into the state space in the DRQN; it considered the amplitude and frequency action spaces and the historical effects. On the other hand, Mandralis et al. ["}}]}, "properties": [], "parentId": "374", "childIds": [], "backendDOMNodeId": 8455}, {"nodeId": "1257", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "81", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "81"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "374", "childIds": ["2150"], "backendDOMNodeId": 8456, "browsergym_id": "d8b13833-0d5b-47b6"}, {"nodeId": "1258", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] deployed reinforcement learning to discover swimmer escape patterns constrained by the energy and prescribed functional form of the body motion, which can be transferred to the control of aquatic robotic devices operating under energy constraints. In addition, Yu et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] deployed reinforcement learning to discover swimmer escape patterns constrained by the energy and prescribed functional form of the body motion, which can be transferred to the control of aquatic robotic devices operating under energy constraints. In addition, Yu et al. ["}}]}, "properties": [], "parentId": "374", "childIds": [], "backendDOMNodeId": 8458}, {"nodeId": "1259", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "82", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "82"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "374", "childIds": ["2151"], "backendDOMNodeId": 8459, "browsergym_id": "73cdc67a-e840-4b7f"}, {"nodeId": "1260", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] numerically studied the collective locomotions of multiple undulatory self-propelled foils swimming by Q-learning algorithm. Especially swimming efficiency is the reward function, and visual information is included. It is found that the DRL algorithm can effectively discover various collective patterns with different characteristics, i.e., the staggered-following, tandem-following phalanx, and compact modes under two DRL strategies. The strategies are as follows: one is that only the following fish gets hydrodynamic advantages, and the other is that all group members take advantage of the interaction.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] numerically studied the collective locomotions of multiple undulatory self-propelled foils swimming by Q-learning algorithm. Especially swimming efficiency is the reward function, and visual information is included. It is found that the DRL algorithm can effectively discover various collective patterns with different characteristics, i.e., the staggered-following, tandem-following phalanx, and compact modes under two DRL strategies. The strategies are as follows: one is that only the following fish gets hydrodynamic advantages, and the other is that all group members take advantage of the interaction."}}]}, "properties": [], "parentId": "374", "childIds": [], "backendDOMNodeId": 8461}, {"nodeId": "1261", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As for the gliding, there is also some work related to reinforcement learning, aiming at performing minimal mechanical work to control attitude. Reddy et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As for the gliding, there is also some work related to reinforcement learning, aiming at performing minimal mechanical work to control attitude. Reddy et al. ["}}]}, "properties": [], "parentId": "375", "childIds": [], "backendDOMNodeId": 8463}, {"nodeId": "1262", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "83", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "83"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "375", "childIds": ["2152"], "backendDOMNodeId": 8464, "browsergym_id": "38693970-c27a-46e1"}, {"nodeId": "1263", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] used Q learning to train a glider in the field to navigate atmospheric thermals autonomously, equipped with a flight controller that precisely controlled the bank angle and pitch, modulating these at intervals to gain as much lift as possible. The learned flight policy was validated through field experiments, numerical simulations, and estimates of the noise in measurements caused by atmospheric turbulence. Different from improving lift, Novati et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] used Q learning to train a glider in the field to navigate atmospheric thermals autonomously, equipped with a flight controller that precisely controlled the bank angle and pitch, modulating these at intervals to gain as much lift as possible. The learned flight policy was validated through field experiments, numerical simulations, and estimates of the noise in measurements caused by atmospheric turbulence. Different from improving lift, Novati et al. ["}}]}, "properties": [], "parentId": "375", "childIds": [], "backendDOMNodeId": 8466}, {"nodeId": "1264", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "84", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "84"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "375", "childIds": ["2153"], "backendDOMNodeId": 8467, "browsergym_id": "b8117cd2-c1c5-4ff5"}, {"nodeId": "1265", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] combined a two-dimensional model of a controlled elliptical body with DRL to achieve gliding with either minimum energy expenditure, or the fastest time of arrival, at a predetermined location. As seen in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] combined a two-dimensional model of a controlled elliptical body with DRL to achieve gliding with either minimum energy expenditure, or the fastest time of arrival, at a predetermined location. As seen in "}}]}, "properties": [], "parentId": "375", "childIds": [], "backendDOMNodeId": 8469}, {"nodeId": "1266", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 9", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 9"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "375", "childIds": ["2154"], "backendDOMNodeId": 8470, "browsergym_id": "b4fb5d56-9e19-4870"}, {"nodeId": "1267", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", the model-free reinforcement learning led to more robust gliding than model-based optimal control policies with a modest additional computational cost. This study also demonstrated that the gliders with DRL can generalize their strategies to reach the objective location from previously unseen starting positions.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", the model-free reinforcement learning led to more robust gliding than model-based optimal control policies with a modest additional computational cost. This study also demonstrated that the gliders with DRL can generalize their strategies to reach the objective location from previously unseen starting positions."}}]}, "properties": [], "parentId": "375", "childIds": [], "backendDOMNodeId": 8472}, {"nodeId": "1268", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 9", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 9"}}]}, "properties": [], "parentId": "377", "childIds": [], "backendDOMNodeId": 8475}, {"nodeId": "1269", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "378", "childIds": ["2155"], "backendDOMNodeId": 8477, "browsergym_id": "ba82a23e-0e5f-474c"}, {"nodeId": "1270", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "378", "childIds": ["2156", "2157", "2158", "2159", "2160", "2161", "2162", "2163", "2164", "2165"], "backendDOMNodeId": 8479, "browsergym_id": "87971159-7dfa-493b"}, {"nodeId": "1271", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Challenges on DRL-Based Active Flow Control", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Challenges on DRL-Based Active Flow Control"}}]}, "properties": [], "parentId": "382", "childIds": [], "backendDOMNodeId": 8499}, {"nodeId": "1272", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Modern control theory provides an essential basis for developing flow control methods from open-loop control to closed-loop control. However, there may be better uses of time and resources than the detailed identification of a high-dimensional nonlinear fluid dynamical system for control. Alternatively, reinforcement learning with deep learning enables automatic feature engineering and end-to-end learning through gradient descent, so reliance on the flow mechanism is significantly reduced, shown in Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Modern control theory provides an essential basis for developing flow control methods from open-loop control to closed-loop control. However, there may be better uses of time and resources than the detailed identification of a high-dimensional nonlinear fluid dynamical system for control. Alternatively, reinforcement learning with deep learning enables automatic feature engineering and end-to-end learning through gradient descent, so reliance on the flow mechanism is significantly reduced, shown in Section "}}]}, "properties": [], "parentId": "383", "childIds": [], "backendDOMNodeId": 8501}, {"nodeId": "1273", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "383", "childIds": ["2166"], "backendDOMNodeId": 8502, "browsergym_id": "19cc0d60-f1ef-4e7e"}, {"nodeId": "1274", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ".", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "."}}]}, "properties": [], "parentId": "383", "childIds": [], "backendDOMNodeId": 8504}, {"nodeId": "1275", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Though highlighted as a novel and promising direction, there are still some obstacles in the initial stage of DRL-based flow control. Some of these obstacles originate from the demand for practical reinforcement learning algorithms since direct numerical simulation, or experimental data are expensive to obtain in flow control problems. And others might be constrained by the flow control system\u2019s characteristics, such as control delay, sensor configuration, partial observation, etc. These obstacles have come to light during the application, and researchers have specified corresponding solutions with the knowledge of the physical system. More importantly, they have revealed potential problems and provided valuable references for similar issues, which are summarized in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Though highlighted as a novel and promising direction, there are still some obstacles in the initial stage of DRL-based flow control. Some of these obstacles originate from the demand for practical reinforcement learning algorithms since direct numerical simulation, or experimental data are expensive to obtain in flow control problems. And others might be constrained by the flow control system\u2019s characteristics, such as control delay, sensor configuration, partial observation, etc. These obstacles have come to light during the application, and researchers have specified corresponding solutions with the knowledge of the physical system. More importantly, they have revealed potential problems and provided valuable references for similar issues, which are summarized in "}}]}, "properties": [], "parentId": "384", "childIds": [], "backendDOMNodeId": 8506}, {"nodeId": "1276", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Table 2", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Table 2"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "384", "childIds": ["2167"], "backendDOMNodeId": 8507, "browsergym_id": "ddc025f4-4e6b-4e04"}, {"nodeId": "1277", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ". The following section will focus on four aspects of challenges in using DRL-based active flow control: Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". The following section will focus on four aspects of challenges in using DRL-based active flow control: Section "}}]}, "properties": [], "parentId": "384", "childIds": [], "backendDOMNodeId": 8509}, {"nodeId": "1278", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "384", "childIds": ["2168"], "backendDOMNodeId": 8510, "browsergym_id": "6b23e048-70d4-427a"}, {"nodeId": "1279", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", Section "}}]}, "properties": [], 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"browsergym_id": "89474db6-eaa6-45c8"}, {"nodeId": "1291", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Training Acceleration", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Training Acceleration"}}]}, "properties": [], "parentId": "390", "childIds": [], "backendDOMNodeId": 8538}, {"nodeId": "1292", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Essentially, deep reinforcement learning is an optimization process based on parameterized policy (usually called \u201cagent\u201d) through trial and error, which involves many interactions between the agent and the emulator. Therefore, compared to supervised/unsupervised learning, deep reinforcement learning is more time-consuming. Especially for the active flow control problem, the expensive data acquisition cost is required either in numerical simulation or wind tunnel experiment to represent the high dimensional flow state. On the other hand, the weakly-inductive-bias characteristic of reinforcement learning brings more possibilities and time consumption. To handle these issues, some works have been carried out on accelerating simulations or extracting prior knowledge from expert information for reinforcement learning, such as expert demonstrations, behavior cloning, or transfer learning.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Essentially, deep reinforcement learning is an optimization process based on parameterized policy (usually called \u201cagent\u201d) through trial and error, which involves many interactions between the agent and the emulator. Therefore, compared to supervised/unsupervised learning, deep reinforcement learning is more time-consuming. Especially for the active flow control problem, the expensive data acquisition cost is required either in numerical simulation or wind tunnel experiment to represent the high dimensional flow state. On the other hand, the weakly-inductive-bias characteristic of reinforcement learning brings more possibilities and time consumption. To handle these issues, some works have been carried out on accelerating simulations or extracting prior knowledge from expert information for reinforcement learning, such as expert demonstrations, behavior cloning, or transfer learning."}}]}, "properties": [], "parentId": "391", "childIds": [], "backendDOMNodeId": 8540}, {"nodeId": "1293", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "From the perspective of accelerating simulation, Rabault et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "From the perspective of accelerating simulation, Rabault et al. ["}}]}, "properties": [], "parentId": "392", "childIds": [], "backendDOMNodeId": 8542}, {"nodeId": "1294", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "95", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "95"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "392", "childIds": ["2176"], "backendDOMNodeId": 8543, "browsergym_id": "db58b58f-af5b-49c1"}, {"nodeId": "1295", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] demonstrated a perfect speedup by adapting the PPO algorithm for parallelization, which used several independent simulations running in parallel to collect experiences faster. As for extracting prior knowledge from expert information for reinforcement learning, Xie [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] demonstrated a perfect speedup by adapting the PPO algorithm for parallelization, which used several independent simulations running in parallel to collect experiences faster. As for extracting prior knowledge from expert information for reinforcement learning, Xie ["}}]}, "properties": [], "parentId": "392", "childIds": [], "backendDOMNodeId": 8545}, {"nodeId": "1296", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "96", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "96"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "392", "childIds": ["2177"], "backendDOMNodeId": 8546, "browsergym_id": "3c254c5a-1646-4d16"}, {"nodeId": "1297", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] firstly derived a simplified parametric control policy informed from direct DRL in sloshing suppression and then accelerated the DRL algorithm with a behavior cloning such simplified policy. Wang [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] firstly derived a simplified parametric control policy informed from direct DRL in sloshing suppression and then accelerated the DRL algorithm with a behavior cloning such simplified policy. Wang ["}}]}, "properties": [], "parentId": "392", "childIds": [], "backendDOMNodeId": 8548}, {"nodeId": "1298", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "98", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "98"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "392", "childIds": ["2178"], "backendDOMNodeId": 8549, "browsergym_id": "2c935e29-f353-4f1d"}, {"nodeId": "1299", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] transferred the DRL neural network trained with Re = 100, 200, 300 to the flow control tasks with Re = 200, 300, 1,000. As shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] transferred the DRL neural network trained with Re = 100, 200, 300 to the flow control tasks with Re = 200, 300, 1,000. As shown in "}}]}, "properties": [], "parentId": "392", "childIds": [], "backendDOMNodeId": 8551}, {"nodeId": "1300", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 10", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 10"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "392", "childIds": ["2179"], "backendDOMNodeId": 8552, "browsergym_id": "0bd31dc4-0012-4df4"}, {"nodeId": "1301", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", it is due to the strong correlation between policy and the flow patterns under different conditions. Therefore a dramatic enhancement of learning efficiency can be achieved.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", it is due to the strong correlation between policy and the flow patterns under different conditions. Therefore a dramatic enhancement of learning efficiency can be achieved."}}]}, "properties": [], "parentId": "392", "childIds": [], "backendDOMNodeId": 8554}, {"nodeId": "1302", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 10", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 10"}}]}, "properties": [], "parentId": "394", "childIds": [], "backendDOMNodeId": 8557}, {"nodeId": "1303", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "395", "childIds": ["2180"], "backendDOMNodeId": 8559, "browsergym_id": "0134bde5-cae7-4a2d"}, {"nodeId": "1304", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "395", "childIds": ["2181", "2182", "2183", "2184"], "backendDOMNodeId": 8561, "browsergym_id": "6cfcaa18-615d-43c0"}, {"nodeId": "1305", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Furthermore, Konishi [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Furthermore, Konishi ["}}]}, "properties": [], "parentId": "398", "childIds": [], "backendDOMNodeId": 8571}, {"nodeId": "1306", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "97", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "97"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "398", "childIds": ["2185"], "backendDOMNodeId": 8572, "browsergym_id": "79472747-6a0b-41b2"}, {"nodeId": "1307", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] introduced a physically reasonable transfer learning method for the trained mixer under different P\u00e9clet numbers. The balance transferability and fast learning on the P\u00e9clet number of the source domain were discussed. By filling the experience buffer with expert demonstrations, Zheng [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] introduced a physically reasonable transfer learning method for the trained mixer under different P\u00e9clet numbers. The balance transferability and fast learning on the P\u00e9clet number of the source domain were discussed. By filling the experience buffer with expert demonstrations, Zheng ["}}]}, "properties": [], "parentId": "398", "childIds": [], "backendDOMNodeId": 8574}, {"nodeId": "1308", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "99", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "99"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "398", "childIds": ["2186"], "backendDOMNodeId": 8575, "browsergym_id": "eeabbfbb-3882-4886"}, {"nodeId": "1309", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] proposed a novel off-policy reinforcement learning framework with a surrogate model optimization method, which enables data-efficient learning of active flow control strategies.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] proposed a novel off-policy reinforcement learning framework with a surrogate model optimization method, which enables data-efficient learning of active flow control strategies."}}]}, "properties": [], "parentId": "398", "childIds": [], "backendDOMNodeId": 8577}, {"nodeId": "1310", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Control Delays", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Control Delays"}}]}, "properties": [], "parentId": "399", "childIds": [], "backendDOMNodeId": 8579}, {"nodeId": "1311", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As the Reynolds number increases, temporal drag fluctuations under the DRL-controlled cylinder case tend to become increasingly more random and severe. Due to the appearance of turbulence in the state space, insufficient regression of the ANN with the time series during the decision process may result in deteriorating control robustness and temporal coherence. Due to the time elapse between actuation and response of flow, Mao [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As the Reynolds number increases, temporal drag fluctuations under the DRL-controlled cylinder case tend to become increasingly more random and severe. Due to the appearance of turbulence in the state space, insufficient regression of the ANN with the time series during the decision process may result in deteriorating control robustness and temporal coherence. Due to the time elapse between actuation and response of flow, Mao ["}}]}, "properties": [], "parentId": "400", "childIds": [], "backendDOMNodeId": 8581}, {"nodeId": "1312", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "100", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "100"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "400", "childIds": ["2187"], "backendDOMNodeId": 8582, "browsergym_id": "b79dfffd-544f-4f05"}, {"nodeId": "1313", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] introduced the Markov decision process (MDP) with time delays to quantify the action delays in the DRL process by using a first-order autoregressive policy (ARP). This hybrid DRL method yielded a stable and coherent control, which resulted in a steadier and more elongated vortex formation zone behind the two-dimensional circular cylinder, hence, a much weaker vortex-shedding process and less fluctuating lift and drag forces. This method utilized the historical samples without additional training sampling than the standard DRL method. It can reduce drag and lift fluctuations by approximately 90% while achieving a similar level of drag reduction in the deterministic control at the same actuation frequency.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] introduced the Markov decision process (MDP) with time delays to quantify the action delays in the DRL process by using a first-order autoregressive policy (ARP). This hybrid DRL method yielded a stable and coherent control, which resulted in a steadier and more elongated vortex formation zone behind the two-dimensional circular cylinder, hence, a much weaker vortex-shedding process and less fluctuating lift and drag forces. This method utilized the historical samples without additional training sampling than the standard DRL method. It can reduce drag and lift fluctuations by approximately 90% while achieving a similar level of drag reduction in the deterministic control at the same actuation frequency."}}]}, "properties": [], "parentId": "400", "childIds": [], "backendDOMNodeId": 8584}, {"nodeId": "1314", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Sensor Configuration", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Sensor Configuration"}}]}, "properties": [], "parentId": "401", "childIds": [], "backendDOMNodeId": 8586}, {"nodeId": "1315", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In the closed-loop control framework, such as deep reinforcement learning, the sensor must be able to measure and provide a correct representation of the state of the flow system. The choice of the sensors, such as the type, number, and location, has a decisive effect on the maximum performance of the control policy. Extravagant sensor configuration is a huge and unnecessary burden in practical applications. The sensors measuring velocity, pressure, skin friction, and temperature in various resolutions, are mostly configured based on engineering experience. There is much room for improvement in adaptive algorithms, such as performing stability analysis or adopting novel optimization methods to obtain optimal and sensitive sensor locations.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In the closed-loop control framework, such as deep reinforcement learning, the sensor must be able to measure and provide a correct representation of the state of the flow system. The choice of the sensors, such as the type, number, and location, has a decisive effect on the maximum performance of the control policy. Extravagant sensor configuration is a huge and unnecessary burden in practical applications. The sensors measuring velocity, pressure, skin friction, and temperature in various resolutions, are mostly configured based on engineering experience. There is much room for improvement in adaptive algorithms, such as performing stability analysis or adopting novel optimization methods to obtain optimal and sensitive sensor locations."}}]}, "properties": [], "parentId": "402", "childIds": [], "backendDOMNodeId": 8588}, {"nodeId": "1316", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "In terms of stability analysis, Ren et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "In terms of stability analysis, Ren et al. ["}}]}, "properties": [], "parentId": "403", "childIds": [], "backendDOMNodeId": 8590}, {"nodeId": "1317", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "71", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "71"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "403", "childIds": ["2188"], "backendDOMNodeId": 8591, "browsergym_id": "4e9fd165-6a95-4a95"}, {"nodeId": "1318", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] performed a sensitivity analysis on the learned control policies to explore the layout of the sensor network by using the Python library SALib. It is concluded that the control had different sensitivity to locations and velocity components. Li et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] performed a sensitivity analysis on the learned control policies to explore the layout of the sensor network by using the Python library SALib. It is concluded that the control had different sensitivity to locations and velocity components. Li et al. ["}}]}, "properties": [], "parentId": "403", "childIds": [], "backendDOMNodeId": 8593}, {"nodeId": "1319", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "101", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "101"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "403", "childIds": ["2189"], "backendDOMNodeId": 8594, "browsergym_id": "d43077b2-6a52-4c80"}, {"nodeId": "1320", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] conducted global linear stability and sensitivity analyses based on the adjoint method. It is found that the control is most efficient when the probes are placed in the most sensitive region, and it can be successful even when a few probes are properly placed in this manner. This work is a successful example of using and embedding physical flow information in the RL-based control. The Comparison between different probe distributions is shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] conducted global linear stability and sensitivity analyses based on the adjoint method. It is found that the control is most efficient when the probes are placed in the most sensitive region, and it can be successful even when a few probes are properly placed in this manner. This work is a successful example of using and embedding physical flow information in the RL-based control. The Comparison between different probe distributions is shown in "}}]}, "properties": [], "parentId": "403", "childIds": [], "backendDOMNodeId": 8596}, {"nodeId": "1321", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "Figure 11", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "Figure 11"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "403", "childIds": ["2190"], "backendDOMNodeId": 8597, "browsergym_id": "ea91d50a-2b1d-46de"}, {"nodeId": "1322", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ".", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "."}}]}, "properties": [], "parentId": "403", "childIds": [], "backendDOMNodeId": 8599}, {"nodeId": "1323", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "FIGURE 11", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "FIGURE 11"}}]}, "properties": [], "parentId": "405", "childIds": [], "backendDOMNodeId": 8602}, {"nodeId": "1324", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "www.frontiersin.org", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "www.frontiersin.org"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "406", "childIds": ["2191"], "backendDOMNodeId": 8604, "browsergym_id": "4627ce21-bb49-4c34"}, {"nodeId": "1325", "ignored": false, "role": {"type": "role", "value": "paragraph"}, "chromeRole": {"type": "internalRole", "value": 133}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "406", "childIds": ["2192", "2193", "2194", "2195", "2196", "2197", "2198", "2199"], "backendDOMNodeId": 8606, "browsergym_id": "37e2c71a-e41e-4967"}, {"nodeId": "1326", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "As for the optimization methods, Paris et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "As for the optimization methods, Paris et al. ["}}]}, "properties": [], "parentId": "409", "childIds": [], "backendDOMNodeId": 8622}, {"nodeId": "1327", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "102", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "102"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "409", "childIds": ["2200"], "backendDOMNodeId": 8623, "browsergym_id": "cdc28461-098d-409f"}, {"nodeId": "1328", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] introduced a novel algorithm (S-PPO-CMA) to optimize the sensor layout, focusing on the efficiency and robustness of the identified control policy. Along with a systematic study on sensor number and location, the proposed sparsity-seeking algorithm achieved a successful optimization with a reduced five-sensor layout while keeping state-of-the-art performance. Castellanos et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] introduced a novel algorithm (S-PPO-CMA) to optimize the sensor layout, focusing on the efficiency and robustness of the identified control policy. Along with a systematic study on sensor number and location, the proposed sparsity-seeking algorithm achieved a successful optimization with a reduced five-sensor layout while keeping state-of-the-art performance. Castellanos et al. ["}}]}, "properties": [], "parentId": "409", "childIds": [], "backendDOMNodeId": 8625}, {"nodeId": "1329", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "38", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "38"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "409", "childIds": ["2201"], "backendDOMNodeId": 8626, "browsergym_id": "3dfc80ce-91f3-45af"}, {"nodeId": "1330", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] optimized the control policy by combining deep reinforcement learning and linear genetic programming control (LGPC) algorithm, which showed the capability of LGPC in identifying a subset of probes as the most relevant locations. In addition, Takada et al. [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] optimized the control policy by combining deep reinforcement learning and linear genetic programming control (LGPC) algorithm, which showed the capability of LGPC in identifying a subset of probes as the most relevant locations. In addition, Takada et al. ["}}]}, "properties": [], "parentId": "409", "childIds": [], "backendDOMNodeId": 8628}, {"nodeId": "1331", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "79", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "79"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "409", "childIds": ["2202"], "backendDOMNodeId": 8629, "browsergym_id": "26f3bebe-02e3-4900"}, {"nodeId": "1332", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] have adopted a new network structure named Attention Branch Network to visualize the activation area of the DRL network, which provided references for sensor distribution. Especially, Attention Branch Network (ABN) [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] have adopted a new network structure named Attention Branch Network to visualize the activation area of the DRL network, which provided references for sensor distribution. Especially, Attention Branch Network (ABN) ["}}]}, "properties": [], "parentId": "409", "childIds": [], "backendDOMNodeId": 8631}, {"nodeId": "1333", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "105", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "105"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "409", "childIds": ["2203"], "backendDOMNodeId": 8632, "browsergym_id": "50e7e8de-5717-46d9"}, {"nodeId": "1334", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] is a method to clarify the basis of the decision of neural networks, which enables the generation of an attention map to visualize the areas the neural network focuses on. It is clarified that the leading-edge pressure sensor is more important for determining the control action, and the trained neural network focused on the time variation of the pressure coefficient measured at the leading edge.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] is a method to clarify the basis of the decision of neural networks, which enables the generation of an attention map to visualize the areas the neural network focuses on. It is clarified that the leading-edge pressure sensor is more important for determining the control action, and the trained neural network focused on the time variation of the pressure coefficient measured at the leading edge."}}]}, "properties": [], "parentId": "409", "childIds": [], "backendDOMNodeId": 8634}, {"nodeId": "1335", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Partial Observables", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Partial Observables"}}]}, "properties": [], "parentId": "410", "childIds": [], "backendDOMNodeId": 8636}, {"nodeId": "1336", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "Most current DRL algorithms assume that the environment evolves as a Markov decision process (MDP), and a learning agent can observe the environment state fully. However, in the real world, there are many cases where only partial observation of the state is possible. That is why existing reinforcement learning (RL) algorithms for fluid control may be inefficient under a small number of observables, even if the flow is laminar. By incorporating the dissipative system\u2019s low-dimensional space [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Most current DRL algorithms assume that the environment evolves as a Markov decision process (MDP), and a learning agent can observe the environment state fully. However, in the real world, there are many cases where only partial observation of the state is possible. That is why existing reinforcement learning (RL) algorithms for fluid control may be inefficient under a small number of observables, even if the flow is laminar. By incorporating the dissipative system\u2019s low-dimensional space ["}}]}, "properties": [], "parentId": "411", "childIds": [], "backendDOMNodeId": 8638}, {"nodeId": "1337", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "106", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "106"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "411", "childIds": ["2204"], "backendDOMNodeId": 8639, "browsergym_id": "48ba00b1-2b3d-4943"}, {"nodeId": "1338", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] of the learning algorithm, Kubo [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] of the learning algorithm, Kubo ["}}]}, "properties": [], "parentId": "411", "childIds": [], "backendDOMNodeId": 8641}, {"nodeId": "1339", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "103", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "103"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "411", "childIds": ["2205"], "backendDOMNodeId": 8642, "browsergym_id": "08696690-827d-4a5f"}, {"nodeId": "1340", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] resolved this problem and presented a framework for RL that can stably optimize the policy with a partially observable condition. In the practical application of a learning process in a fluid system like a learning agent without any information about flow state except rigid-body motion, the algorithm in this study can efficiently find the optimum control method.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] resolved this problem and presented a framework for RL that can stably optimize the policy with a partially observable condition. 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This method relies on satisfactorily exploiting invariance and locality properties of the 1D falling liquid film system, which can be extended to other physics systems with similar properties. Inspired by the Convolutional Neural Networks (CNNs), three different methods for the DRL agent are designed as shown in ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] proposed a DRL framework to handle an arbitrary number of control actions (jets). This method relies on satisfactorily exploiting invariance and locality properties of the 1D falling liquid film system, which can be extended to other physics systems with similar properties. 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This work set small regions in the neighborhood of each jet, where states and rewards were obtained. Methods 3 (\u201dM3\u201d) took into account this locality and extract N reward signals (the number of jets) to evaluate local behaviors with less dimension. Results showed both a good learning acceleration and easy control on an arbitrarily large number of jets and overcomed the curse of dimensionality on the control output size that would take place using a naive approach.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ". This work set small regions in the neighborhood of each jet, where states and rewards were obtained. Methods 3 (\u201dM3\u201d) took into account this locality and extract N reward signals (the number of jets) to evaluate local behaviors with less dimension. 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The fluid system\u2019s high dimensionality, nonlinearity, and stochasticity limit the flow control policy exploration. It has yet to be widely applied in aviation or the marine industry. As a critical branch of artificial intelligence, reinforcement learning with deep learning enables automatic feature engineering and end-to-end learning through gradient descent so that reliance on domain knowledge is significantly reduced or even removed. Moreover, the deep and distributed representations in deep understanding can exploit the hierarchical composition of factors in data to combat the exponential challenges of the curse of dimensionality [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "Exploring flow mechanisms and controlling flow has always been one of the most important and fruitful topics for researchers. The fluid system\u2019s high dimensionality, nonlinearity, and stochasticity limit the flow control policy exploration. It has yet to be widely applied in aviation or the marine industry. As a critical branch of artificial intelligence, reinforcement learning with deep learning enables automatic feature engineering and end-to-end learning through gradient descent so that reliance on domain knowledge is significantly reduced or even removed. 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While there are some obstacles inevitably, like the demand to accelerate the training process (Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "]. While there are some obstacles inevitably, like the demand to accelerate the training process (Section "}}]}, "properties": [], "parentId": "423", "childIds": [], "backendDOMNodeId": 8801}, {"nodeId": "1390", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "423", "childIds": ["2232"], "backendDOMNodeId": 8802, "browsergym_id": "31925f45-e668-4f96"}, {"nodeId": "1391", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ") or the constraints related to the control system\u2019s characteristics, such as Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ") or the constraints related to the control system\u2019s characteristics, such as Section "}}]}, "properties": [], "parentId": "423", "childIds": [], "backendDOMNodeId": 8804}, {"nodeId": "1392", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "423", "childIds": ["2233"], "backendDOMNodeId": 8805, "browsergym_id": "8a140523-a1eb-497c"}, {"nodeId": "1393", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", Section "}}]}, "properties": [], "parentId": "423", "childIds": [], "backendDOMNodeId": 8807}, {"nodeId": "1394", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "423", "childIds": ["2234"], "backendDOMNodeId": 8808, "browsergym_id": "3e9bf329-8ec5-4477"}, {"nodeId": "1395", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", partial observation (Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", partial observation (Section "}}]}, "properties": [], "parentId": "423", "childIds": [], "backendDOMNodeId": 8810}, {"nodeId": "1396", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "423", "childIds": ["2235"], "backendDOMNodeId": 8811, "browsergym_id": "cb246154-da39-4841"}, {"nodeId": "1397", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "), Section ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "), Section "}}]}, "properties": [], "parentId": "423", "childIds": [], "backendDOMNodeId": 8813}, {"nodeId": "1398", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "423", "childIds": ["2236"], "backendDOMNodeId": 8814, "browsergym_id": "8cb6fade-11a0-468b"}, {"nodeId": "1399", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": ", etc. This review has introduced five topics with their solutions, and more challenges are invisible below sea level, just like icebergs. We advocate that the physical information of the flow should be embedded into the DRL-based active flow control framework. More advanced data-driven methods should be fully utilized to discover the inherent association under big data. Efficient frameworks embedded with physical knowledge under practical background can promote the wide industrial application of intelligent, active flow control technology to the greatest extent. Based on the above research and our experience, it is inferred that the study of active flow control based on deep reinforcement learning in the future can be focused on the following five aspects:", "sources": [{"type": "contents", "value": {"type": "computedString", "value": ", etc. This review has introduced five topics with their solutions, and more challenges are invisible below sea level, just like icebergs. We advocate that the physical information of the flow should be embedded into the DRL-based active flow control framework. More advanced data-driven methods should be fully utilized to discover the inherent association under big data. Efficient frameworks embedded with physical knowledge under practical background can promote the wide industrial application of intelligent, active flow control technology to the greatest extent. Based on the above research and our experience, it is inferred that the study of active flow control based on deep reinforcement learning in the future can be focused on the following five aspects:"}}]}, "properties": [], "parentId": "423", "childIds": [], "backendDOMNodeId": 8816}, {"nodeId": "1400", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "(1) ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "(1) "}}]}, "properties": [], "parentId": "424", "childIds": [], "backendDOMNodeId": 8818}, {"nodeId": "1401", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "424", "childIds": ["2237"], "backendDOMNodeId": 8819, "browsergym_id": "f48aa2fe-00f9-4b46"}, {"nodeId": "1402", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " Compared with Atari, Go, and other traditional research fields of intensive learning, the cost of data acquisition is usually higher compared to numerical simulation or wind tunnel tests. Moreover, the high-dimensional feature extraction and random system characteristics are significant challenges to the convergence of these algorithms. It is of great significance to make more rational use of data, including offline paradigm [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " Compared with Atari, Go, and other traditional research fields of intensive learning, the cost of data acquisition is usually higher compared to numerical simulation or wind tunnel tests. Moreover, the high-dimensional feature extraction and random system characteristics are significant challenges to the convergence of these algorithms. It is of great significance to make more rational use of data, including offline paradigm ["}}]}, "properties": [], "parentId": "424", "childIds": [], "backendDOMNodeId": 8821}, {"nodeId": "1403", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "123", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "123"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "424", "childIds": ["2238"], "backendDOMNodeId": 8822, "browsergym_id": "688fe38d-764e-440e"}, {"nodeId": "1404", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], model building [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], model building ["}}]}, "properties": [], "parentId": "424", "childIds": [], "backendDOMNodeId": 8824}, {"nodeId": "1405", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "124", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "124"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "424", "childIds": ["2239"], "backendDOMNodeId": 8825, "browsergym_id": "e013fade-fc08-44b8"}, {"nodeId": "1406", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], data augmentation [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], data augmentation ["}}]}, "properties": [], "parentId": "424", "childIds": [], "backendDOMNodeId": 8827}, {"nodeId": "1407", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "125", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "125"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "424", "childIds": ["2240"], "backendDOMNodeId": 8828, "browsergym_id": "50348878-3d94-49f9"}, {"nodeId": "1408", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "], etc.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "], etc."}}]}, "properties": [], "parentId": "424", "childIds": [], "backendDOMNodeId": 8830}, {"nodeId": "1409", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "(2) ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "(2) "}}]}, "properties": [], "parentId": "425", "childIds": [], "backendDOMNodeId": 8832}, {"nodeId": "1410", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "425", "childIds": ["2241"], "backendDOMNodeId": 8833, "browsergym_id": "a45e9bb8-d888-40b9"}, {"nodeId": "1411", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " The pure AI algorithm neglects the dynamics and believes in the data-driven concept, which is also doomed to be inefficient. It is brighter to combine the physical information into the DRL framework and develop artificial intelligence technology based on the full use of classical fluid mechanics research methods.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " The pure AI algorithm neglects the dynamics and believes in the data-driven concept, which is also doomed to be inefficient. It is brighter to combine the physical information into the DRL framework and develop artificial intelligence technology based on the full use of classical fluid mechanics research methods."}}]}, "properties": [], "parentId": "425", "childIds": [], "backendDOMNodeId": 8835}, {"nodeId": "1412", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "(3) ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "(3) "}}]}, "properties": [], "parentId": "426", "childIds": [], "backendDOMNodeId": 8837}, {"nodeId": "1413", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "426", "childIds": ["2242"], "backendDOMNodeId": 8838, "browsergym_id": "72993cd5-d0ec-4e92"}, {"nodeId": "1414", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " Learning to control agents from high-dimensional inputs relies upon engineering problem-specific state representations, reducing the agent\u2019s flexibility. Embedding feature extraction in deep neural networks exposes deficiencies such as a lack of explanation, limiting the application of intelligent methods. Explainable AI methods [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " Learning to control agents from high-dimensional inputs relies upon engineering problem-specific state representations, reducing the agent\u2019s flexibility. Embedding feature extraction in deep neural networks exposes deficiencies such as a lack of explanation, limiting the application of intelligent methods. Explainable AI methods ["}}]}, "properties": [], "parentId": "426", "childIds": [], "backendDOMNodeId": 8840}, {"nodeId": "1415", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "126", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "126"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "426", "childIds": ["2243"], "backendDOMNodeId": 8841, "browsergym_id": "5abf88e3-0b80-470c"}, {"nodeId": "1416", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] are advocated to improve the interpretability of intelligent control. With the help of such practices, further exploration of more fundamental physical connotations and scientific cognition of fluid mechanics is expected.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] are advocated to improve the interpretability of intelligent control. With the help of such practices, further exploration of more fundamental physical connotations and scientific cognition of fluid mechanics is expected."}}]}, "properties": [], "parentId": "426", "childIds": [], "backendDOMNodeId": 8843}, {"nodeId": "1417", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "(4) ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "(4) "}}]}, "properties": [], "parentId": "427", "childIds": [], "backendDOMNodeId": 8845}, {"nodeId": "1418", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "427", "childIds": ["2244"], "backendDOMNodeId": 8846, "browsergym_id": "9d54b0aa-3db9-49c6"}, {"nodeId": "1419", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " In practical applications like aircraft flight, it is unsafe to train agents directly by trial and error. However, the reality gap between the simulation and the physical world often leads to failure, which is triggered by an inconsistency between physical parameters (i.e., Reynolds number) and, more fatally, incorrect physical modeling (i.e., observation noise, action delay). Reducing or even eliminating the sim2real gap [", "sources": [{"type": "contents", "value": {"type": "computedString", "value": " In practical applications like aircraft flight, it is unsafe to train agents directly by trial and error. However, the reality gap between the simulation and the physical world often leads to failure, which is triggered by an inconsistency between physical parameters (i.e., Reynolds number) and, more fatally, incorrect physical modeling (i.e., observation noise, action delay). Reducing or even eliminating the sim2real gap ["}}]}, "properties": [], "parentId": "427", "childIds": [], "backendDOMNodeId": 8848}, {"nodeId": "1420", "ignored": false, "role": {"type": "role", "value": "link"}, "chromeRole": {"type": "internalRole", "value": 110}, "name": {"type": "computedString", "value": "127", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "contents", "value": {"type": "computedString", "value": "127"}}, {"type": "attribute", "attribute": "title", "superseded": true}]}, "properties": [{"name": "focusable", "value": {"type": "booleanOrUndefined", "value": true}}], "parentId": "427", "childIds": ["2245"], "backendDOMNodeId": 8849, "browsergym_id": "a7d35538-1912-4b18"}, {"nodeId": "1421", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "] is a crucial step in applying reinforcement learning to industrial applications.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] is a crucial step in applying reinforcement learning to industrial applications."}}]}, "properties": [], "parentId": "427", "childIds": [], "backendDOMNodeId": 8851}, {"nodeId": "1422", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "(5) ", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "(5) "}}]}, "properties": [], "parentId": "428", "childIds": [], "backendDOMNodeId": 8853}, {"nodeId": "1423", "ignored": false, "role": {"type": "role", "value": "emphasis"}, "chromeRole": {"type": "internalRole", "value": 81}, "name": {"type": "computedString", "value": "", "sources": [{"type": "relatedElement", "attribute": "aria-labelledby"}, {"type": "attribute", "attribute": "aria-label"}, {"type": "attribute", "attribute": "title"}]}, "properties": [], "parentId": "428", "childIds": ["2246"], "backendDOMNodeId": 8854, "browsergym_id": "26fa0e8c-bc41-4ce1"}, {"nodeId": "1424", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": " The rapid development of deep reinforcement learning in the field of active flow control owes to the fact that many predecessors published the code while publishing articles. 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Such sharing and openness can not only let fluid mechanics researchers understand the latest release and update of DRL tools, but also let machine learning researchers understand the development direction of algorithms applied to complex physical systems. This review calls on researchers to further share code and open source benchmarks, build a multidisciplinary open source community, further strengthen cooperation, and promote the application of reinforcement learning in the field of fluid mechanics.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "] and others on the Github, including containers for full reproducibility. Such sharing and openness can not only let fluid mechanics researchers understand the latest release and update of DRL tools, but also let machine learning researchers understand the development direction of algorithms applied to complex physical systems. This review calls on researchers to further share code and open source benchmarks, build a multidisciplinary open source community, further strengthen cooperation, and promote the application of reinforcement learning in the field of fluid mechanics."}}]}, "properties": [], "parentId": "428", "childIds": [], "backendDOMNodeId": 8868}, {"nodeId": "1433", "ignored": false, "role": {"type": "internalRole", "value": "StaticText"}, "chromeRole": {"type": "internalRole", "value": 158}, "name": {"type": "computedString", "value": "To summarize, deep reinforcement learning has established the beacon for active flow control, and its talent potential in complex flow system remain to be explored. Especially in the aviation industry, it is expected that this control mode can reach unprecedented heights and realize the impossible missions in many science fiction films, for example, rudderless aircraft controlled by jets, long-endurance vehicles with weak or even no drag, etc. It is no doubt there is still a long way before DRL-based flow control realizes real-world application, but it has promised us a bright future.", "sources": [{"type": "contents", "value": {"type": "computedString", "value": "To summarize, deep reinforcement learning has established the beacon for active flow control, and its talent potential in complex flow system remain to be explored. 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\ No newline at end of file