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Remove calls to CopyFrom that can be sync (pytorch#13205)
Summary: Pull Request resolved: pytorch#13205 CopyFrom without context argument does the sync copy on the current gpu - exactly what most of the places need. This diff kills about 60% of CopyFrom usages. Most common pattern is gpu->cpu copy with further FinishDeviceComputation - the latter can be just killed. Reviewed By: Yangqing Differential Revision: D11236076 fbshipit-source-id: eb790ca494dfc5d5e3a7d850b45d6f73221bb204
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