Github user imatiach-msft commented on a diff in the pull request:
https://github.com/apache/spark/pull/16722#discussion_r98599986
--- Diff:
mllib/src/main/scala/org/apache/spark/ml/classification/DecisionTreeClassifier.scala
---
@@ -106,14 +122,18 @@ class DecisionTreeClassifier @Since("1.4.0") (
".train() called with non-matching numClasses and
thresholds.length." +
s" numClasses=$numClasses, but thresholds has length
${$(thresholds).length}")
}
-
- val oldDataset: RDD[LabeledPoint] = extractLabeledPoints(dataset,
numClasses)
--- End diff --
it looks like by removing this method call you are removing some valuable
validation logic (that exists in the base class).
specifically, this is the logic:
require(numClasses > 0, s"Classifier (in extractLabeledPoints) found
numClasses =" +
s" $numClasses, but requires numClasses > 0.")
require(label % 1 == 0 && label >= 0 && label < numClasses, s"Classifier
was given" +
s" dataset with invalid label $label. Labels must be integers in
range" +
s" [0, $numClasses).")
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