Github user iyerr3 commented on the issue:
https://github.com/apache/incubator-madlib/pull/117
Reading the commit description again, I would rephrase it as
"Reduce the defaults for max_depth to 7 and num_splits to 20 to **minimize
the chances of running out of memory** when initializing tree for problems
with many features or with features with many categorical values."
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