Github user chouqin commented on a diff in the pull request:
https://github.com/apache/spark/pull/2595#discussion_r18260795
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -437,6 +433,7 @@ object DecisionTree extends Serializable with Logging {
* @param treeToNodeToIndexInfo Mapping: treeIndex --> nodeIndex -->
nodeIndexInfo,
* where nodeIndexInfo stores the index in
the group and the
* feature subsets (if using feature
subsets).
+ * @param nodeToFeatures Mapping: nodeIndexInGroup -> feature subsets
--- End diff --
yes, this is a duplication, but as described in the documentation of
`RandomForest.selectNodesToSplit`, it is a shortcut for to find feature indices
a node given node index in group.
Maybe we can construct `nodeToFeatures` in `DecisionTree.findBestSplits`.
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