Regularization is not supported in FP16 (#21319)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/21319
Add assertion to raise Exception when Regularization is applied on FP16.
Reviewed By: bddppq
Differential Revision: D15528486
fbshipit-source-id: c887c90d1d9ccfdaded3b5fa16816c6f29910e2e
