huifengguo commented on issue #17728: Poor performance when we use mx.symbol.Variable(..,..,stype="row-sparse") to define the variable URL: https://github.com/apache/incubator-mxnet/issues/17728#issuecomment-594966736 > Yes, if you look at the Adam optimization algorithm, zero grad does not lead to zero update. But SGD and Adagrad does. So we have to live with the loss of accuracy if we use Adam optimization algorithm and row-sparse variable?
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