Github user yu-iskw commented on the pull request:
https://github.com/apache/spark/pull/8435#issuecomment-134835735
LGTM, minus the @feynmanliang point.
Apart from this issue, it seems that there is an unnecessary comment in
PowerIterationClustering.scala. We should remove it.
https://github.com/mengxr/spark/blob/SPARK-10234/mllib/src/main/scala/org/apache/spark/mllib/clustering/PowerIterationClustering.scala#L74
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