pytorch

b4fa4c86 - Port hardshrink_backward and softshrink_backward to structured (#58662)

Port hardshrink_backward and softshrink_backward to structured (#58662) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/58662 Test Plan: Imported from OSS Reviewed By: gchanan Differential Revision: D28572532 Pulled By: ezyang fbshipit-source-id: 8ecebc1090d884ee579f5d04a46f1e60a2dd978e