Github user avulanov commented on the pull request:

    https://github.com/apache/spark/pull/1290#issuecomment-67087128
  
    @witgo @ankurdave Thank you for suggestion! I merged #3677 into the ANN 
code and then I run 100 iterations on mnist (60K instances). The running time 
improved only 1%. Is it expected to be so small or it should be bigger in 
different settings? Could you elaborate on how the mentioned PR might improve 
performance or this PR? 


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