[GitHub] [spark] WeichenXu123 commented on pull request #32245: [SPARK-35142][PYTHON][ML] Fix incorrect return type for `rawPredictionUDF` in `OneVsRestModel`

[GitBox <gi...@apache.org>]

WeichenXu123 commented on pull request #32245:
URL: https://github.com/apache/spark/pull/32245#issuecomment-823883887


   @harupy 
   
   Backport to branch-3.1 cause conflicts.
   Could you create a PR against apache/spark branch-3.1 ?
   
   ```
   ++<<<<<<< HEAD
    +    def test_parallelism_doesnt_change_output(self):
   ++=======
   +     def test_raw_prediction_column_is_of_vector_type(self):
   +         # SPARK-35142: `OneVsRestModel` outputs raw prediction as a string column
   +         df = self.spark.createDataFrame([(0.0, Vectors.dense(1.0, 0.8)),
   +                                          (1.0, Vectors.sparse(2, [], [])),
   +                                          (2.0, Vectors.dense(0.5, 0.5))],
   +                                         ["label", "features"])
   +         lr = LogisticRegression(maxIter=5, regParam=0.01)
   +         ovr = OneVsRest(classifier=lr, parallelism=1)
   +         model = ovr.fit(df)
   +         row = model.transform(df).head()
   +         self.assertIsInstance(row["rawPrediction"], DenseVector)
   + 
   +     def test_parallelism_does_not_change_output(self):
   ++>>>>>>> b6350f5bb0... [SPARK-35142][PYTHON][ML] Fix incorrect return type for `rawPredictionUDF` in `OneVsRestModel`
   ```


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