Github user facaiy commented on a diff in the pull request:
    --- Diff: python/pyspark/ml/ ---
    @@ -1344,7 +1346,19 @@ def _fit(self, dataset):
             numClasses = int(dataset.agg({labelCol: 
"max"}).head()["max("+labelCol+")"]) + 1
    -        multiclassLabeled =, featuresCol)
    +        weightCol = None
    +        if (self.isDefined(self.weightCol) and self.getWeightCol()):
    +            if isinstance(classifier, HasWeightCol):
    +                weightCol = self.getWeightCol()
    +            else:
    +                warnings.warn("weightCol is ignored, "
    +                              "as it is not supported by {} now.".format(
    --- End diff --
    Thank you very much for help, @yanboliang !

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