Github user yanboliang commented on the pull request: https://github.com/apache/spark/pull/12066#issuecomment-214136838 @jkbradley Thanks for your comments, please see my inline reply to your concerns. Because there are no attributes were stored in label column metadata of ```PredictionModel``` currently, I only made changes for ```ClassificationModel``` in this PR. Any thoughts, please let me know. I have add one test case for ```NaiveBayesModel```. If needed, I can add test for other classification model.
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