imatiach-msft commented on issue #21632: [SPARK-19591][ML][MLlib] Add sample 
weights to decision trees
URL: https://github.com/apache/spark/pull/21632#issuecomment-458404664
 
 
   @srowen thanks for the quick response, I've created a follow-up PR here:
   https://github.com/apache/spark/pull/23682
   In testing I've found the tolerance:
   val tolerance = Utils.EPSILON * unweightedNumSamples * 100
   to be good enough, not sure if I need to make it larger

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