eric-haibin-lin edited a comment 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-595037908 Yes, there's no free food. You can still "use Adam and row_sparse variable" with `lazy_update=False` to get identical update, the only benefit you get is less that data is transmitted during communication
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