Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/2435#discussion_r17943417
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -649,71 +542,65 @@ object DecisionTree extends Serializable with Logging
{
// Calculate bin aggregates.
timer.start("aggregation")
val binAggregates: DTStatsAggregator = {
- val initAgg = new DTStatsAggregator(metadata, numNodes)
+ val initAgg = if (metadata.subsamplingFeatures) {
+ assert(featuresForNodes.nonEmpty)
+ new DTStatsAggregatorSubsampledFeatures(metadata, groupNodeIndex,
featuresForNodes.get)
+ } else {
+ new DTStatsAggregatorFixedFeatures(metadata, numNodes)
+ }
input.treeAggregate(initAgg)(binSeqOp, DTStatsAggregator.binCombOp)
}
timer.stop("aggregation")
- // Calculate best splits for all nodes at a given level
+ // Calculate best splits for all nodes in the group
timer.start("chooseSplits")
- // On the first iteration, we need to get and return the newly created
root node.
- var newTopNode: Node = topNode
-
- // Iterate over all nodes at this level
- var nodeIndex = 0
- var internalNodeCount = 0
- while (nodeIndex < numNodes) {
- val (split: Split, stats: InformationGainStats, predict: Predict) =
- binsToBestSplit(binAggregates, nodeIndex, level, metadata, splits)
- logDebug("best split = " + split)
- val globalNodeIndex = globalNodeIndexOffset + nodeIndex
-
- // Extract info for this node at the current level.
- val isLeaf = (stats.gain <= 0) || (level == metadata.maxDepth)
- val node =
- new Node(globalNodeIndex, predict.predict, isLeaf, Some(split),
None, None, Some(stats))
- logDebug("Node = " + node)
-
- if (!isLeaf) {
- internalNodeCount += 1
- }
- if (level == 0) {
- newTopNode = node
- } else {
- // Set parent.
- val parentNode = Node.getNode(Node.parentIndex(globalNodeIndex),
topNode)
- if (Node.isLeftChild(globalNodeIndex)) {
- parentNode.leftNode = Some(node)
+ // Iterate over all nodes in this group.
+ groupNodeIndex.foreach{ case (treeIndex, nodeIndexToAggIndex) =>
--- End diff --
space before `{`
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