Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2708#discussion_r18606429
--- Diff: mllib/src/main/scala/org/apache/spark/mllib/tree/model/Node.scala
---
@@ -170,7 +173,27 @@ private[tree] object Node {
/**
* Return a node with the given node id (but nothing else set).
*/
- def emptyNode(nodeIndex: Int): Node = new Node(nodeIndex, 0, false,
None, None, None, None)
+ def emptyNode(nodeIndex: Int): Node = new Node(nodeIndex, new
Predict(Double.MinValue), -1.0,
+ false, None, None, None, None)
+
+ /**
+ * Construct a node with nodeIndex, predict, impurity and isLeaf
parameters.
+ * This is used in `DecisionTree.findBestSplits` to construct child nodes
+ * after find best splits for each node.
+ * Other fields are set at next level.
+ * @param nodeIndex integer node id, from 1
+ * @param predict predicted value at the node
+ * @param impurity current node impurity
+ * @param isLeaf whether the leaf is a node
--- End diff --
"whether the leaf is a node" --> "whether the node is a leaf"
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