Fix expansion of stride argument in max_pool3d (#23960)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/23960
Signed-off-by: Edward Z. Yang <ezyang@fb.com>
Test Plan: Imported from OSS
Differential Revision: D16695161
Pulled By: ezyang
fbshipit-source-id: 36d1777467bbe3f8842736c570b029b72954e027
