[SPARK-15254][DOC] Improve ML pipeline Cross Validation Scaladoc & PyDoc
## What changes were proposed in this pull request? Updated ML pipeline Cross Validation Scaladoc & PyDoc. ## How was this patch tested? Documentation update (If this patch involves UI changes, please attach a screenshot; otherwise, remove this) Author: krishnakalyan3 <krishnakalyan3@gmail.com> Closes #13894 from krishnakalyan3/kfold-cv.
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@ -55,7 +55,11 @@ private[ml] trait CrossValidatorParams extends ValidatorParams {
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}
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/**
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* K-fold cross validation.
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* K-fold cross validation performs model selection by splitting the dataset into a set of
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* non-overlapping randomly partitioned folds which are used as separate training and test datasets
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* e.g., with k=3 folds, K-fold cross validation will generate 3 (training, test) dataset pairs,
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* each of which uses 2/3 of the data for training and 1/3 for testing. Each fold is used as the
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* test set exactly once.
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*/
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@Since("1.2.0")
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class CrossValidator @Since("1.2.0") (@Since("1.4.0") override val uid: String)
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@ -188,7 +192,9 @@ object CrossValidator extends MLReadable[CrossValidator] {
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}
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/**
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* Model from k-fold cross validation.
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* CrossValidatorModel contains the model with the highest average cross-validation
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* metric across folds and uses this model to transform input data. CrossValidatorModel
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* also tracks the metrics for each param map evaluated.
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*
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* @param bestModel The best model selected from k-fold cross validation.
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* @param avgMetrics Average cross-validation metrics for each paramMap in
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@ -143,7 +143,13 @@ class ValidatorParams(HasSeed):
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class CrossValidator(Estimator, ValidatorParams):
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"""
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K-fold cross validation.
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K-fold cross validation performs model selection by splitting the dataset into a set of
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non-overlapping randomly partitioned folds which are used as separate training and test datasets
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e.g., with k=3 folds, K-fold cross validation will generate 3 (training, test) dataset pairs,
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each of which uses 2/3 of the data for training and 1/3 for testing. Each fold is used as the
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test set exactly once.
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>>> from pyspark.ml.classification import LogisticRegression
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>>> from pyspark.ml.evaluation import BinaryClassificationEvaluator
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@ -260,7 +266,10 @@ class CrossValidator(Estimator, ValidatorParams):
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class CrossValidatorModel(Model, ValidatorParams):
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"""
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Model from k-fold cross validation.
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CrossValidatorModel contains the model with the highest average cross-validation
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metric across folds and uses this model to transform input data. CrossValidatorModel
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also tracks the metrics for each param map evaluated.
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.. versionadded:: 1.4.0
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"""
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