Github user mengxr commented on a diff in the pull request: https://github.com/apache/spark/pull/3975#discussion_r23566837 --- Diff: mllib/src/main/scala/org/apache/spark/mllib/tree/impurity/Entropy.scala --- @@ -94,6 +94,9 @@ private[tree] class EntropyAggregator(numClasses: Int) throw new IllegalArgumentException(s"EntropyAggregator given label $label" + s" but requires label < numClasses (= $statsSize).") } + if (label < 0) { + throw new IllegalArgumentException(s"Entropy does not support negative labels") --- End diff -- Shall we put `label` value to the error message? Add `.` to the end of the sentence.
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