Change the type hints of "pooling.py". (#48412)
Summary:
Change the type hints of "AvgPool2d" and "AvgPool3d".
Pull Request resolved: https://github.com/pytorch/pytorch/pull/48412
Reviewed By: ejguan
Differential Revision: D25221087
Pulled By: ezyang
fbshipit-source-id: 5fba2a8051a7b3d5508e97763bacfd2140a777bf