Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/2595#issuecomment-58549566
For boosting, it's common to use even depth 1 trees (stumps). For RFs, I'm
pretty sure that many more trees are needed (at least enough for a Central
Limit Theorem to kick in). I'd say:
* For most problems, the current method is fine.
* For boosting small trees or stumps, we may need a specialized
implementation at some point but should not worry for now.
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