Github user iyerr3 commented on the pull request: https://github.com/apache/incubator-madlib/pull/42#issuecomment-222223823 I have made some changes and added validation and online help functions (in my [private fork branch](https://github.com/iyerr3/incubator-madlib/commits/feature/pred_metrics_take2)). I have not implemented the SRF versions as discussed earlier. We can make those functions as a separate work. @orhankislal could you please pull in the 3 commits on that branch and update your branch to update this PR. Once we've discussed the changes here, I can merge the commits to master.
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