annotator/oneformer/detectron2/layers/shape_spec.py

# -*- coding: utf-8 -*-
# Copyright (c) Facebook, Inc. and its affiliates.
from dataclasses import dataclass
from typing import Optional


@dataclass
class ShapeSpec:
    """

    A simple structure that contains basic shape specification about a tensor.

    It is often used as the auxiliary inputs/outputs of models,

    to complement the lack of shape inference ability among pytorch modules.

    """

    channels: Optional[int] = None
    height: Optional[int] = None
    width: Optional[int] = None
    stride: Optional[int] = None