Github user imatiach-msft commented on a diff in the pull request:
https://github.com/apache/spark/pull/16722#discussion_r99274459
--- Diff:
mllib/src/main/scala/org/apache/spark/mllib/tree/impurity/Entropy.scala ---
@@ -83,23 +83,29 @@ object Entropy extends Impurity {
* @param numClasses Number of classes for label.
*/
private[spark] class EntropyAggregator(numClasses: Int)
- extends ImpurityAggregator(numClasses) with Serializable {
+ extends ImpurityAggregator(numClasses + 1) with Serializable {
--- End diff --
sorry, trying to follow this part of the code, why do we pass (numClasses +
1) to the impurityAggregator?
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