Forward fix mypy (#62263)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/62263
Fixes current HUD Error: https://github.com/pytorch/pytorch/runs/3170342799
Test Plan: Imported from OSS
Reviewed By: jbschlosser
Differential Revision: D29935265
Pulled By: ejguan
fbshipit-source-id: 6f247833d24bff7aea42f6287493a85d62d73b96
