Github user mengxr commented on the pull request:
https://github.com/apache/spark/pull/2595#issuecomment-57358460
@chouqin I tested `mnist8m` on an 8-node m3.2xlarge cluster (10 trees with
depth 10). With this change, the running time reduced to 429s from 552s. I will
check the implementation later and see whether we can optimize further.
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