eric-haibin-lin 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-593221090 you can set lazy_update=False for Adam to force disable sparse update. This will give you the same result as dense weight/gradient
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