Forward fix mypy for #61820 (#62398)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/62398
Test Plan: Imported from OSS
Reviewed By: malfet, anjali411
Differential Revision: D29988610
Pulled By: ejguan
fbshipit-source-id: 700dfa5b1c415bc058390bbe5727a739c8419b0f
