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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