FP16 rounding-to-nearest for row-wise SparseAdagrad fusion (#40466)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/40466
Extend row wise sparse Adagrad fusion op to FP16 (rounding-to-nearest) for PyTorch.
Reviewed By: jianyuh
Differential Revision: D22003571
fbshipit-source-id: e97e01745679a9f6e7b0f81ce5a6ebf4d4a1df41
