Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/1798#discussion_r15854094 --- 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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