Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2708#discussion_r18604330
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -587,17 +598,26 @@ object DecisionTree extends Serializable with Logging
{
// Extract info for this node. Create children if not leaf.
val isLeaf = (stats.gain <= 0) || (Node.indexToLevel(nodeIndex) ==
metadata.maxDepth)
assert(node.id == nodeIndex)
- node.predict = predict.predict
+ node.predict = predict
node.isLeaf = isLeaf
node.stats = Some(stats)
+ node.impurity = stats.impurity
logDebug("Node = " + node)
if (!isLeaf) {
node.split = Some(split)
- node.leftNode =
Some(Node.emptyNode(Node.leftChildIndex(nodeIndex)))
- node.rightNode =
Some(Node.emptyNode(Node.rightChildIndex(nodeIndex)))
- nodeQueue.enqueue((treeIndex, node.leftNode.get))
- nodeQueue.enqueue((treeIndex, node.rightNode.get))
+ val childIsLeaf = (Node.indexToLevel(nodeIndex) + 1) ==
metadata.maxDepth
--- End diff --
We can also check stats.leftImpurity and rightImpurity. If
stats.leftImpurity = 0, then we know the left child will be a leaf. Same for
the right child.
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