tree d2b7636147d643b93fc4816d7db0693ad0a6587a
parent 47b65b6d8d38fef62fc15b115a26b595f09b5f02
author Xian Li <xianl@fb.com> 1487776447 -0800
committer Facebook Github Bot <facebook-github-bot@users.noreply.github.com> 1487776586 -0800

Implement EnsureDenseOp and EnsureDenseGradientOp.

Summary:
This operator can always outputs dense gradients regardless of
the input gradients. For forward pass, it passes inputs to outputs in place.

Reviewed By: xianjiec

Differential Revision: D4582511

fbshipit-source-id: 7eb2c5d2142aa05d373f06cab1e7f89d8b747d34