Mllib:java.lang.IllegalArgumentException:GiniAggregator given label 2.0 but requires label < NUMCLA

Error message:

Java.lang.IllegalArgumentException:GiniAggregator given label 2.0 but requires label < numclasses (= 2)


When using Mllib to classify, it is often necessary to add a Gini coefficient when some classification algorithms are used.
Program code:

Randomforest.trainclassifier (Validdata,2,map[int,int] (), ten, "Auto", "Gini", 8,32)

When encountering the wrong information, note: label<numclasses, the algorithm requires that the Gini coefficient is less than the number of classes. At this point, according to the error message to change the numclasses to a larger number than your label.

To understand the reason for the correspondence between label and numclasses, we need to study the algorithm further.

Mllib:java.lang.IllegalArgumentException:GiniAggregator given label 2.0 but requires label < NUMCLA