Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/5626#discussion_r28987617
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/impl/tree/treeParams.scala ---
@@ -298,3 +302,200 @@ private[ml] object TreeRegressorParams {
// These options should be lowercase.
val supportedImpurities: Array[String] =
Array("variance").map(_.toLowerCase)
}
+
+/**
+ * :: DeveloperApi ::
+ * Parameters for Decision Tree-based ensemble algorithms.
+ *
+ * Note: Marked as private and DeveloperApi since this may be made public
in the future.
+ */
+@DeveloperApi
+private[ml] trait TreeEnsembleParams extends DecisionTreeParams {
+
+ /**
+ * Fraction of the training data used for learning each decision tree.
+ * (default = 1.0)
+ * @group param
+ */
+ final val subsamplingRate: DoubleParam = new DoubleParam(this,
"subsamplingRate",
+ "Fraction of the training data used for learning each decision tree.")
+
+ /**
+ * Random seed for bootstrapping and choosing feature subsets.
+ * @group param
+ */
+ final val seed: LongParam = new LongParam(this, "seed",
--- End diff --
This should go to shared params.
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