Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/3439#issuecomment-64474382
I just pushed an update which includes:
* removing the 1/2 from SquaredError. This also required updating the test
suite since it effectively doubles the gradient and loss.
* Added doc for developers within RandomForest.
* small cleanup in test suite (generating data only once)
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