pytorch

e787872a - [RELAND] Deduplicate shared params before constructing Reducer in DDP (#53279)

[RELAND] Deduplicate shared params before constructing Reducer in DDP (#53279) Summary: Original PR https://github.com/pytorch/pytorch/pull/51929 seemed to trigger failures in `pytorch_linux_xenial_py3_clang5_asan_test2`. Resubmitting to figure out why, and hopefully reland. Pull Request resolved: https://github.com/pytorch/pytorch/pull/53279 Reviewed By: mrshenli Differential Revision: D26916701 Pulled By: zhaojuanmao fbshipit-source-id: 75c74c8ad8ad24154eb59eddb2b222da0a09897e