Avg pool 0 dim acceptance. (#50008)
Summary:
Reopen https://github.com/pytorch/pytorch/pull/47426 since it failed for XLA tests.
Pull Request resolved: https://github.com/pytorch/pytorch/pull/50008
Reviewed By: mruberry
Differential Revision: D25857687
Pulled By: ngimel
fbshipit-source-id: 8bd47a17b417b20089cf003173d8c0793be58c72
