huaxingao opened a new pull request #25715: [SPARK-28969][PYTHON][ML] OneVsRestParams parity between scala and python URL: https://github.com/apache/spark/pull/25715 ### What changes were proposed in this pull request? Follow the scala ```OneVsRestParams``` implementation, move ```setClassifier``` from ```OneVsRestParams``` to ```OneVsRest``` in Pyspark ### Why are the changes needed? 1. Maintain the parity between scala and python code. 2. ```Classifier``` can only be set in the estimator. ### Does this PR introduce any user-facing change? Yes. Previous behavior: ```OneVsRestModel``` has method ```setClassifier``` Current behavior: ```setClassifier``` is removed from ```OneVsRestModel```. ```classifier``` can only be set in ```OneVsRest```. ### How was this patch tested? Use existing tests
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