Github user jkbradley commented on a diff in the pull request:
https://github.com/apache/spark/pull/1975#discussion_r16327981
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -531,7 +526,7 @@ object DecisionTree extends Serializable with Logging {
// numNodes: Number of nodes in this (level of tree, group),
// where nodes at deeper (larger) levels may be divided
into groups.
- val numNodes = math.pow(2, level).toInt / numGroups
+ val numNodes = (1 << level) / numGroups
logDebug("numNodes = " + numNodes)
// Find the number of features by looking at the first sample.
--- End diff --
Thanks! I forgot to port that change from my next PR.
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