Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/9474#discussion_r56438348
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/impl/DTStatsAggregator.scala
---
@@ -73,26 +73,31 @@ private[spark] class DTStatsAggregator(
* Flat array of elements.
* Index for start of stats for a (feature, bin) is:
* index = featureOffsets(featureIndex) + binIndex * statsSize
- * Note: For unordered features,
- * the left child stats have binIndex in [0, numBins(featureIndex)
/ 2))
- * and the right child stats in [numBins(featureIndex) / 2),
numBins(featureIndex))
*/
private val allStats: Array[Double] = new Array[Double](allStatsSize)
+ /**
+ * Array of parent node sufficient stats.
--- End diff --
Add note: "This is necessary because stats for the parent node are not
available on the first iteration of tree learning."
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