Remove gradient value as input from SparseNormalize op (#24357)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/24357
SparseNormalize does not need to know the gradient value to the lookup table, only the indices of the embeddings that need to be updated. By removing this input, we allow SparseNormalize to be used alongside SparseAdagradFusion
Differential Revision: D16809919
fbshipit-source-id: cc19692ba4dea8854663ae1ed8cf9365e90c99bc
