Github user mengxr commented on a diff in the pull request:
https://github.com/apache/spark/pull/1798#discussion_r15854129
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/DecisionTree.scala ---
@@ -1334,10 +1519,10 @@ object DecisionTree extends Serializable with
Logging {
* (a) For multiclass classification with a low-arity feature
* (i.e., if isMulticlass &&
isSpaceSufficientForAllCategoricalSplits),
* the feature is split based on subsets of categories.
- * There are 2^(maxFeatureValue - 1) - 1 splits.
+ * There are math.pow(2, (maxFeatureValue - 1) - 1) splits.
* (b) For regression and binary classification,
* and for multiclass classification with a high-arity feature,
--- End diff --
`,` -> `.`
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