Fix expansion of stride argument in avg_pool3d (#23963)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23963
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D16695160
Pulled By: ezyang
fbshipit-source-id: dc8fd1f0c7096fcd4eb48ce42069307915052a77
