pytorch

acba9b31 - [DDP Communication Hook] Simplify the implementation of parseHookResult of PythonCommHook (#62389)

[DDP Communication Hook] Simplify the implementation of parseHookResult of PythonCommHook (#62389) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/62389 Simplify the implementation of `parseHookResult` of `PythonCommHook`, by not directly accepting the output of allreduce, which is a tensor list. Address the comment on https://github.com/pytorch/pytorch/pull/62074#discussion_r675303280 Additionally, formatter is also applied to `OptimizerHookState` and `hook_then_optimizer`. ghstack-source-id: 134626246 Test Plan: buck test mode/dev-nosan caffe2/test/distributed:c10d buck test mode/dev-nosan caffe2/test/distributed:distributed_nccl_fork Reviewed By: rohan-varma Differential Revision: D29982485 fbshipit-source-id: 5b27cc5ef09d2f87c1ade4c0feef7eacc1af3a9a