Github user yanboliang commented on the pull request:
https://github.com/apache/spark/pull/12066#issuecomment-213466446
@jkbradley Thanks for your comments, please see my inline reply to your
concerns.
I have add test case. 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.
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