huaxingao opened a new pull request #26057: [SPARK-29377][PYTHON][ML] Parity between Scala ML tuning and Python ML tuning URL: https://github.com/apache/spark/pull/26057 ### What changes were proposed in this pull request? Follow Scala ml tuning implementation - put leading underscore before python ```ValidatorParams``` to indicate private - add ```_CrossValidatorParams``` and ```_TrainValidationSplitParams``` - separate the getters and setters. Put getters in _XXXParams and setters in the Classes. ### Why are the changes needed? Keep parity between scala and python ### Does this PR introduce any user-facing change? add ```CrossValidatorModel.getNumFolds``` and ```TrainValidationSplitModel.getTrainRatio()``` ### How was this patch tested? Add doctest
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