Github user yanboliang commented on a diff in the pull request:
https://github.com/apache/spark/pull/18764#discussion_r131523236
--- Diff: python/pyspark/ml/classification.py ---
@@ -1344,7 +1346,19 @@ def _fit(self, dataset):
numClasses = int(dataset.agg({labelCol:
"max"}).head()["max("+labelCol+")"]) + 1
- multiclassLabeled = dataset.select(labelCol, 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 --
See my comment
[here](https://github.com/apache/spark/pull/18763#pullrequestreview-54516447).
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