Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/20632#discussion_r168936124
--- Diff: mllib/src/main/scala/org/apache/spark/ml/tree/Node.scala ---
@@ -287,6 +292,41 @@ private[tree] class LearningNode(
}
}
+ /**
+ * Method testing whether a node is a leaf.
+ * @return true iff a node is a leaf.
+ */
+ private def isLeafNode(): Boolean = leftChild.isEmpty &&
rightChild.isEmpty
+
+ /** True iff the node should be a leaf. */
+ private lazy val shouldBeLeaf: Boolean = leafPredictions.size == 1
+
+ /**
+ * Returns the set of (leaf) predictions appearing in the subtree rooted
at the considered node.
+ * @return the set of (leaf) predictions appearing in the subtree rooted
at the given node.
+ */
+ private def leafPredictions: Set[Double] = {
+
+ val predBuffer = new scala.collection.mutable.HashSet[Double]
+
+ // collect the (leaf) predictions in the left subtree, if any
+ if (leftChild.isDefined) {
--- End diff --
No, I'm just thinking you use `Option.foreach(...)` twice. It's a matter of
taste I guess. I tend to prefer avoiding the `isDefined` and `get` calls for
simple one-liners.
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