Tagar commented on issue #25032: Add root degree to PolynomialExpansion URL: https://github.com/apache/spark/pull/25032#issuecomment-508857876 We use `sqrt` for engineered features quite often, for some of the variables with a larger scale of values. Haven't seen our DS folks use anything else by 0.5 (sqrt) for the `pow` .. it doesn't mean somebody else doesn't have use cases for this. Thanks!
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