Stop doing nn wrap. (#25353)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/25353
It doesn't seem necessary anymore.
Test Plan: Imported from OSS
Differential Revision: D17101569
Pulled By: gchanan
fbshipit-source-id: 67a198ae594dcd64dbd7cf6a73e2160e26e3513e
