Extend SparseAdagrad fusion with stochastic rounding FP16 (#41107)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/41107
Extend row wise sparse Adagrad fusion op to FP16 (stochastic rounding) for PyTorch.
Differential Revision: D22195408
fbshipit-source-id: e9903ca7ca3b542fb56f36580e69bb2a39b554f6
