Github user hqzizania commented on the issue: https://github.com/apache/spark/pull/14449 Percentage is a useful addition to ChiSquareSelector, it is a common and intuitive param to data scientists and statistician as scikit-learn has, but it may be not worthy a whole other API in MLlib indeed. @srowen I suppose it could be implemented by adding a new Param in ML.ChiSqSelector?
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