Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/22986#discussion_r234412163
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/treeParams.scala ---
@@ -258,11 +258,7 @@ private[ml] object TreeClassifierParams {
private[ml] trait DecisionTreeClassifierParams
extends DecisionTreeParams with TreeClassifierParams
-/**
- * Parameters for Decision Tree-based regression algorithms.
- */
-private[ml] trait TreeRegressorParams extends Params {
--- End diff --
That's true, but I don't know if we can back-port it because of the binary
incompatibility, internal as it may be. I don't know. If it's not an issue then
yes it can back port
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