[SPARK-10957] [ML] setParams changes quantileProbabilities unexpectly in...

[SPARK-10957] [ML] setParams changes quantileProbabilities unexpectly in PySpark's AFTSurvivalRegression

If user doesn't specify `quantileProbs` in `setParams`, it will get reset to the default value. We don't need special handling here. vectorijk yanboliang

Author: Xiangrui Meng <meng@databricks.com>

Closes #9001 from mengxr/SPARK-10957.

python/pyspark/ml/regression.py

@@ -701,11 +701,7 @@ class AFTSurvivalRegression(JavaEstimator, HasFeaturesCol, HasLabelCol, HasPredi
                   quantilesCol=None):
         """
         kwargs = self.setParams._input_kwargs
-        if quantileProbabilities is None:
-            return self._set(**kwargs).setQuantileProbabilities([0.01, 0.05, 0.1, 0.25, 0.5,
-                                                                 0.75, 0.9, 0.95, 0.99])
-        else:
-            return self._set(**kwargs)
+        return self._set(**kwargs)
 
     def _create_model(self, java_model):
         return AFTSurvivalRegressionModel(java_model)