Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/8866#discussion_r48591821
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/treeParams.scala ---
@@ -252,6 +253,35 @@ private[ml] object TreeRegressorParams {
final val supportedImpurities: Array[String] =
Array("variance").map(_.toLowerCase)
}
+private[ml] trait DecisionTreeRegressorParams extends DecisionTreeParams
+ with TreeRegressorParams with HasVarianceCol {
+
+ /** @group setParam */
+ def setVarianceCol(value: String): this.type = set(varianceCol, value)
--- End diff --
Good points, I updated the document of ```varianceCol```.
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