Summary:
close https://github.com/facebookresearch/detectron2/issues/3158

Pull Request resolved: https://github.com/facebookresearch/detectron2/pull/3266

Reviewed By: zhanghang1989

Differential Revision: D29837548

Pulled By: ppwwyyxx

fbshipit-source-id: 08c6341f038117667510e90b1e2a29d64fd38c13