don't allow deletions.

app.py

@@ -6,7 +6,7 @@ from transformers.pipelines import PIPELINE_REGISTRY, FillMaskPipeline
 from transformers import AutoModelForMaskedLM
 
 ex_str1 = "A crustless sandwich made from two slices of baked bread. The sandwich includes first and second matching " \
-          "crustiess bread pieces. The bread pieces have the same general outer shape defined by an outer periphery " \
+          "crustless bread pieces. The bread pieces have the same general outer shape defined by an outer periphery " \
           "with central portions surrounded by an outer peripheral area, the bread pieces being at least partially " \
           "crimped together at the outer peripheral area."
 
@@ -149,6 +149,8 @@ def unmask(text, temp, rounds):
             idx = np.random.randint(0, len(score_list))
         score = score_list[idx]
         new_token = score_to_str[score]
+        if len(list(new_token)) < 2:
+            continue
         split_text[mask_pos] = new_token
         text = ' '.join(split_text)
     text = list(text)
@@ -166,6 +168,7 @@ demo = gr.Interface(
     inputs=[textbox, temp_slider, edit_slider],
     outputs=[output_textbox],
     examples=examples,
+    allow_flagging='never'
 )
 
 demo.launch()