pytorch

63f4b607 - Ensure initializedContextIds_ map is cleaned up appropriately in DistEngine. (#29787)

Ensure initializedContextIds_ map is cleaned up appropriately in DistEngine. (#29787) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/29787 The initializedContextIds_ map was never cleaned up in DistEngine and kept on growing as we continue to run backward passes. To fix this, in this PR we ensure that the context id is cleaned up from this map once we are done with the backward pass. Closes #29083 ghstack-source-id: 94161770 Test Plan: waitforbuildbot Differential Revision: D18498937 fbshipit-source-id: 8d31fc066f6994627766f2b6ca36efa1bef89840