Yi Wang 96aed203bf [Gradient Compression] Replace the assertions in PowerSGD comm hook by stream syncrhonization (#49435) ... Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/49435 Previously the assertion that prevents illegal memory access is because of the torch.any that returns a boolean value, which initiates a data transfer from the device to the host and forces a synchronization. An explicit synchronization is more to the point. Original PR issue: Investigate Applying PowerSGD to Communication Hook for Gradient Compression #47202 ghstack-source-id: 118664204 Test Plan: buck test mode/dev-nosan caffe2/test/distributed:c10d -- test_powerSGD_ddp_comm_hook_nccl buck test mode/dev-nosan caffe2/test/distributed:distributed_nccl_fork -- test_DistributedDataParallel_powerSGD_ddp_comm_hook Reviewed By: rohan-varma Differential Revision: D25573484 fbshipit-source-id: 516d0d502da2863b516c15332702335ee662f072		2020-12-20 17:24:06 -08:00
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ddp_comm_hooks	[Gradient Compression] Replace the assertions in PowerSGD comm hook by stream syncrhonization (#49435)	2020-12-20 17:24:06 -08:00
__init__.py	[Gradient Compression] Add unit tests that test default Python comm hook implementations (#47158)	2020-11-06 00:28:09 -08:00