Github user manishamde commented on the pull request:
https://github.com/apache/spark/pull/2607#issuecomment-60821283
@jkbradley Your understanding is correct. Sorry for not mentioning it
explicitly on the JIRA/PR earlier.
Yes, calculating median, etc. for terminal region predictions in trees will
be hard for the distributed decision tree. I can add a warning mentioning in
what way our implementation is different from Friedman's algorithm. I was
planning to point it out in the documentation.
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