pytorch

2c4b4aa8 - Revert D23494065: Refactor CallbackManager as a nested class of RecordFunction.

Revert D23494065: Refactor CallbackManager as a nested class of RecordFunction. Test Plan: revert-hammer Differential Revision: D23494065 (https://github.com/pytorch/pytorch/commit/63105fd5b192e2fe9310dd0445d73af79e3880b3) Original commit changeset: 416d5bf6c942 fbshipit-source-id: 3b1ec928e3db0cc203bb63ec4db3da1584b9b884