pytorch

b8792c04 - Revert D18645954: add __torch_function__ API override mechanism

Revert D18645954: add __torch_function__ API override mechanism Test Plan: revert-hammer Differential Revision: D18645954 Original commit changeset: 54b5e4344d7a fbshipit-source-id: 4a7aebb483e6b001130d6f384ccc53c5a808ab13