Github user manishamde commented on a diff in the pull request:
https://github.com/apache/spark/pull/1975#discussion_r16328127
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -130,22 +124,37 @@ class DecisionTree (private val strategy: Strategy)
extends Serializable with Lo
// Find best split for all nodes at a level.
timer.start("findBestSplits")
val splitsStatsForLevel = DecisionTree.findBestSplits(treeInput,
parentImpurities,
- strategy, level, filters, splits, bins, maxLevelForSingleGroup,
timer)
+ metadata, level, nodes, splits, bins, maxLevelForSingleGroup,
timer)
timer.stop("findBestSplits")
+ val levelNodeIndexOffset = (1 << level) - 1
--- End diff --
Ditto: comment might help to understand the calculation using bit shift.
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