huaxingao edited a comment 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-549964674 @BryanCutler Yes. In PySpark tests, there is a ```MockUnaryTransformer``` to show the usage of ```UnaryTransformer```. One test covers the methods in ```MockUnaryTransformer``` and another one tests the persistence. These should be good enough.
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