Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2868#discussion_r19178079
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -553,7 +589,26 @@ object DecisionTree extends Serializable with Logging {
// Finally, only best Splits for nodes are collected to driver to
construct decision tree.
val nodeToFeatures = getNodeToFeatures(treeToNodeToIndexInfo)
val nodeToFeaturesBc = input.sparkContext.broadcast(nodeToFeatures)
- val nodeToBestSplits =
+
+ val partitionAggregates = if (useNodeIdCache) {
--- End diff --
Also, could the 2 branches (of the ```if (useNodeIdCache)```) call be
combined, where you test for ```useNodeIdCache``` only for the 1 line which
differs?
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