Github user sethah commented on a diff in the pull request:
https://github.com/apache/spark/pull/20632#discussion_r169735198
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/Node.scala ---
@@ -287,6 +291,34 @@ private[tree] class LearningNode(
}
}
+ /**
+ * @return true iff the node is a leaf.
+ */
+ private def isLeafNode(): Boolean = leftChild.isEmpty &&
rightChild.isEmpty
+
+ // the set of (leaf) predictions appearing in the subtree rooted at the
given node.
+ private lazy val leafPredictions: Set[Double] = {
--- End diff --
What other cases are there that I'm missing? For one thing, the current
tests pass with this change.
This will prune a subtree of arbitrary depth that has a single distinct
prediction in its leaf nodes.
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