Github user hqzizania commented on the issue:
https://github.com/apache/spark/pull/14738
@srowen this is about a @group name called expertParam, just a part of
[SPARK-17090](https://github.com/apache/spark/pull/14717). SPARK-17175 is for a
expert formula which was discussed in
https://issues.apache.org/jira/browse/SPARK-17090
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