pytorch

5f45927d - Autograd: Delay warnings until the end of backward execution (#66235)

Autograd: Delay warnings until the end of backward execution (#66235) Summary: Fixes https://github.com/pytorch/pytorch/issues/50209 This adds a new warning handler that stores all warnings in a shared queue, which can be "replayed" at a later time and, crucially, on another thread. Then, I use this inside the autograd engine to ensure that warnings are processed by the handler registered on the main thread. For testing, I also add an operator that always warns in the backward pass and test that the warning is a normal Python warning. cc ezyang albanD zou3519 gqchen pearu nikitaved soulitzer Lezcano Varal7 Pull Request resolved: https://github.com/pytorch/pytorch/pull/66235 Reviewed By: ejguan Differential Revision: D31505413 Pulled By: albanD fbshipit-source-id: 1a7f60b038f55c20591c0748b9e86735b3fec2f9