Separate affine_channel from math and optimize it (#16135)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/16135
Separate affine_channel from math and optimize it
i-am-not-moving-c2-to-c10
Reviewed By: houseroad
Differential Revision: D13727606
fbshipit-source-id: 8980af4afadaf964a18a9da581106fe30896a7e9
