pytorch

710a83d0 - Remove code and logic for old style custom autograd Function (#57357)

Remove code and logic for old style custom autograd Function (#57357) Summary: Fixes https://github.com/pytorch/pytorch/issues/30696 ### Release Notes Instantiating a custom autograd function is now deprecated. Users should call `.apply()` on the class itself because it is a static method. --end release notes-- - There are a couple error messages that we can't entirely remove because accessing these attributes of the autograd function instance may segfault (due to cdata being nullptr). Also added a TORCH_CHECK for the name attribute which previously segfaulted. - Error message updated to convey 1) old-style functions have been deprecated 2) this access pattern was once valid - Updates variable -> Tensor for some error messages Pull Request resolved: https://github.com/pytorch/pytorch/pull/57357 Reviewed By: mrshenli Differential Revision: D28193095 Pulled By: soulitzer fbshipit-source-id: f021b105e9a3fd4a20d6ee3dfb6a06a8c34b10ca