Github user avulanov commented on the pull request:
https://github.com/apache/spark/pull/1379#issuecomment-67872100
@dbtsai I did local experiment on mnist and your new implementation seems
to be more than 2x faster than the previous one! I am going to perform bigger
experiments. In the meantime, could you suggest if optimizations that you did
are applicable for ANN Gradient? It will be extremely helpful for us.
https://github.com/bgreeven/spark/blob/master/mllib/src/main/scala/org/apache/spark/mllib/ann/ArtificialNeuralNetwork.scala#L467
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