Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/2595#discussion_r18297118
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -518,30 +512,69 @@ object DecisionTree extends Serializable with Logging
{
agg
}
- // Calculate bin aggregates.
- timer.start("aggregation")
- val binAggregates: DTStatsAggregator = {
- val initAgg = if (metadata.subsamplingFeatures) {
- new DTStatsAggregatorSubsampledFeatures(metadata,
treeToNodeToIndexInfo)
- } else {
- new DTStatsAggregatorFixedFeatures(metadata, numNodes)
+ /**
+ * Get node index in group --> features indices map,
+ * which is a short cut to find feature indices for a node given node
index in group
+ * @param treeToNodeToIndexInfo
+ * @return
+ */
+ def getNodeToFeatures(treeToNodeToIndexInfo: Map[Int, Map[Int,
NodeIndexInfo]])
+ :Map[Int, Option[Array[Int]]] = {
--- End diff --
spacing: ":Map" --> ": Map"
---
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