pytorch

5b7cdc5a - add channels last for GroupNorm (#49821)

add channels last for GroupNorm (#49821) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/49821 Test Plan: Imported from OSS Reviewed By: ejguan Differential Revision: D26007053 Pulled By: VitalyFedyunin fbshipit-source-id: 34a48d5d3b66a159febf3c3d96748fbaba1b9e31