pytorch

81fbeea7 - Add docstrings to native_channel_shuffle (#72919)

Add docstrings to native_channel_shuffle (#72919) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/72919 Test Plan: Imported from OSS Reviewed By: bdhirsh Differential Revision: D34274717 Pulled By: VitalyFedyunin fbshipit-source-id: fa42f91ef2335e2594b19ef65d914c711f7a94fd (cherry picked from commit a6f6fe9112aa36d711f240f720615be09e2e13de)