Github user yanboliang commented on the issue: https://github.com/apache/spark/pull/14035 @HyukjinKwon I have made a pass and this PR look good overall. Could you double check whether all ML test cases are covered? Since I found we used implicit import of different style at [```ChiSqSelectorSuite```](https://github.com/apache/spark/blob/master/mllib/src/test/scala/org/apache/spark/ml/feature/ChiSqSelectorSuite.scala#L33), it's better we can unify them. Then I'd like to get this in. Thanks for working on this.
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