Github user sethah commented on the issue:
https://github.com/apache/spark/pull/17503
I think the benefit of this would be for speed at predict time or for model
storage. @srowen the nodes don't have to be equal to be merged, they just have
to output the same prediction. Since this a param that can be turned on or off,
I don't see a problem.
That said, I'd be interested to know how much of an impact this makes. This
is a semi-large change and probably not at the top of the list right now. Maybe
@jkbradley can comment.
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