Fix flake8. (#19832)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19832
ghimport-source-id: 7360a52dbcf83458797c27002afc1fd53ee5907f
Differential Revision: D15115620
Pulled By: ZolotukhinM
fbshipit-source-id: aa62b04facc1e1824a8889a32dace5804daa21df
Author
Mikhail Zolotukhin
