Github user yanboliang commented on the issue:
https://github.com/apache/spark/pull/15955
After offline discussion with @zhengruifeng , we think the validation in
the ```Param``` itself should be better, so other ways (which not calling
setter method) of setting params can also benefit from the validation. We open
[SPARK-18518](https://issues.apache.org/jira/browse/SPARK-18518) to a more
perfect solution.
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