pytorch

22b151a3 - Make sure full backward hook fire when no input requires grad (#56693)

Make sure full backward hook fire when no input requires grad (#56693) Summary: Fixes https://github.com/pytorch/pytorch/issues/56380 BC-breaking note: This changes the behavior of full backward hooks as they will now fire properly even if no input to the Module require gradients. Pull Request resolved: https://github.com/pytorch/pytorch/pull/56693 Reviewed By: ezyang Differential Revision: D27947030 Pulled By: albanD fbshipit-source-id: e8353d769ba5a2c1b6bdf3b64e2d61308cf624a2