Github user srowen commented on the issue:
https://github.com/apache/spark/pull/17556
That's good info. It's a tough call -- matching a known package is always
nice. However I agree that a weighted split is a little more theoretically
sound (don't have a reference on that though). I'd support this change, myself.
It sounds like we won't find an exact match to the R GBM behavior except when
each split has equal numbers of classes on either side.
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