sxjscience commented on issue #2612: Slow speed of the AddTakeGradKernel in 
embedding layer
URL: 
https://github.com/apache/incubator-mxnet/issues/2612#issuecomment-350345689
 
 
   @eric-haibin-lin The backward pass of the embedding layer has been 
accelerated. However, we still need to compute the gradient first and then add 
to the weights. No direct `AddTo` is available.

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