pytorch

a6cd294c - [Gradient Compression] Refactor CommHookInterface and PythonCommHook. (#46512)

[Gradient Compression] Refactor CommHookInterface and PythonCommHook. (#46512) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/46512 1. Merge 1-line PythonCommHook constructor into the header for simplicity. 2. Move the implementation of PythonCommHook destructor from the header file to cpp file. 3. Rename processFuture method as parseHookResult for readability. 4. Simplify some comments. Original PR issue: C++ DDP Communication Hook https://github.com/pytorch/pytorch/issues/46348 ghstack-source-id: 115161086 Test Plan: buck test mode/dev-nosan caffe2/test/distributed:c10d -- test_ddp_comm_hook_allreduce_hook_nccl buck test mode/dev-nosan caffe2/test/distributed:c10d -- test_ddp_comm_hook_sparse_gradients buck test mode/dev-nosan caffe2/test/distributed:c10d -- test_ddp_comm_hook_allreduce_with_then_hook_nccl buck test mode/dev-nosan caffe2/test/distributed:c10d -- test_ddp_comm_hook_future_passing_gpu_gloo Reviewed By: jiayisuse Differential Revision: D24374282 fbshipit-source-id: c8dbdd764bca5b3fa247708f1218cb5ff3e321bb