Github user srowen commented on the pull request: https://github.com/apache/spark/pull/3098#issuecomment-61768877 So, I already find it a bit confusing that there are MLlib examples that actually _reimplement_ the machine learning algorithm instead of using the one in MLlib. This extends that "problem", to me, by reimplementing RMSE. I personally would prefer not to do this, myself.
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