huaxingao opened a new pull request #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 ### What changes were proposed in this pull request? Use UnaryTransformer as parent class for single input column transformers in PySpark ### Why are the changes needed? In Scala, UnaryTransformer is the parent class of all the single input column transformers. In PySpark, we have the corresponding Python version of UnaryTransformer but it's not really used. This Jira will make single input column transformers in Python to use UnaryTransformer as parent class. ### Does this PR introduce any user-facing change? No ### How was this patch tested? Use existing tests.
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