Github user jkbradley commented on the pull request:
https://github.com/apache/spark/pull/2868#issuecomment-61037009
I agree local sub-tree training will be needed to train deep trees. That
should probably be the next priority. I'm running some tests now and will see
if I see different speedups (also on mnist8m, though I may try some synthetic
datasets later for variety).
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