disable flake8 E302 (two blank lines) (#19634)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/19634
ghimport-source-id: 68b11ac3c19daf8df3bbf11e6181e9450899e90a
Differential Revision: D15053466
Pulled By: suo
fbshipit-source-id: 09d7859aa2059fc9eb3b47fa62467537bab40e05
