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-593130470 what optimizer are you using? update rules for some optimizer with sparse grad maybe different: https://mxnet.apache.org/api/python/docs/api/optimizer/index.html#mxnet.optimizer.SGD
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