pytorch

d6970902 - Add a note in DDP doc to point to ZeroRedundancyOptimizer (#53113)

Add a note in DDP doc to point to ZeroRedundancyOptimizer (#53113) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/53113 Test Plan: Imported from OSS Reviewed By: blefaudeux Differential Revision: D26752339 Pulled By: mrshenli fbshipit-source-id: 7a082f1007bc550eabb82b559d020bbe717fa497