Github user wangmiao1981 commented on a diff in the pull request:

    https://github.com/apache/spark/pull/11945#discussion_r57545765
  
    --- Diff: python/pyspark/ml/tests.py ---
    @@ -655,6 +656,20 @@ def test_nested_pipeline_persistence(self):
                 except OSError:
                     pass
     
    +    def test_write_property(self):
    +        lr = LinearRegression(maxIter=1)
    +        path = tempfile.mkdtemp()
    +        lr_path = path + "/lr"
    +        lr.write.save(lr_path)
    --- End diff --
    
    I added similar test before. However, that test doesn't capture the change 
in the inherit class (i.e., missing adding property in inherit class) and Yanbo 
suggested adding a concrete test for testing the functionality. Let me know 
your final decision. Thanks!
    
    Miao


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