pytorch

215950e2 - Convert type annotations in nn/functional.py to py3 syntax (#53656)

Convert type annotations in nn/functional.py to py3 syntax (#53656) Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/53656 Test Plan: Imported from OSS Reviewed By: malfet Differential Revision: D26926018 Pulled By: jamesr66a fbshipit-source-id: 2381583cf93c9c9d0c9eeaa6e41eddce3729942d