huaxingao commented on issue #26370: [SPARK-29727][ML][PYTHON] Use UnaryTransformer as parent class for single input column transformers in PySpark URL: https://github.com/apache/spark/pull/26370#issuecomment-549617356 I will change the three methods to no-op as following in all the subclasses because it's no need to implement them in python side, but I have to implement to make 2.7 work, otherwise, 2.7 throws Exception ```TypeError: Can't instantiate abstract class DCT with abstract methods createTransformFunc, outputDataType, validateInputType``` ``` def _createTransformFunc(self): pass def _outputDataType(self): pass def _validateInputType(self, inputType): pass ```
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