pytorch

8273912a - [Opt Overlap] Implement _OverlappedOptimizer (#71605)

[Opt Overlap] Implement _OverlappedOptimizer (#71605) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/71605 ghstack-source-id: 147577173 Test Plan: CI Reviewed By: cbalioglu Differential Revision: D33692686 fbshipit-source-id: b0fdb45245d923e1de8fef4431d3e235ac57dcbf (cherry picked from commit 8b83dbf690d6f426cc5f3954d77c829a3d302962)