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https://issues.apache.org/jira/browse/SPARK-29428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16949586#comment-16949586
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Huaxin Gao commented on SPARK-29428:
------------------------------------
I will take a look of this.
> Can't persist/set None-valued param
> ------------------------------------
>
> Key: SPARK-29428
> URL: https://issues.apache.org/jira/browse/SPARK-29428
> Project: Spark
> Issue Type: Bug
> Components: ML, PySpark
> Affects Versions: 2.3.2
> Reporter: Borys Biletskyy
> Priority: Major
>
> {code:java}
> import pytest
> from pyspark import keyword_only
> from pyspark.ml import Model
> from pyspark.sql import DataFrame
> from pyspark.ml.util import DefaultParamsReadable, DefaultParamsWritable
> from pyspark.ml.param.shared import HasInputCol
> from pyspark.sql.functions import *
> class NoneParamTester(Model,
> HasInputCol,
> DefaultParamsReadable,
> DefaultParamsWritable
> ):
> @keyword_only
> def __init__(self, inputCol: str = None):
> super(NoneParamTester, self).__init__()
> kwargs = self._input_kwargs
> self.setParams(**kwargs)
> @keyword_only
> def setParams(self, inputCol: str = None):
> kwargs = self._input_kwargs
> self._set(**kwargs)
> return self
> def _transform(self, data: DataFrame) -> DataFrame:
> return data
> class TestNoneParam(object):
> def test_persist_none(self, spark, temp_dir):
> path = temp_dir + '/test_model'
> model = NoneParamTester(inputCol=None)
> assert model.isDefined(model.inputCol)
> assert model.isSet(model.inputCol)
> assert model.getInputCol() is None
> model.write().overwrite().save(path)
> NoneParamTester.load(path) # TypeError: Could not convert <class
> 'NoneType'> to string type
> def test_set_none(self, spark):
> model = NoneParamTester(inputCol=None)
> assert model.isDefined(model.inputCol)
> assert model.isSet(model.inputCol)
> assert model.getInputCol() is None
> model.set(model.inputCol, None) # TypeError: Could not convert
> <class 'NoneType'> to string type
> {code}
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