Github user jkbradley commented on the pull request:

    https://github.com/apache/spark/pull/3636#issuecomment-66178359
  
    @Lewuathe Thanks for the PR!  I added some inline comments.  One more 
general comment: When using subsampling (miniBatchFraction < 1.0), testing 
against a convergenceTolerance can be dangerous because of the stochasticity.  
It can be would be good to add a check at the beginning of optimization to see 
if miniBatchFraction < 1.0 && convergenceTolerance > 0.0.  If that is the case, 
then we should print a warning.
    
    Let me know when I should make another pass over the PR.


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