[7.x][ML] Stratified cross validation split for classification (#54087) #54104
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…ic#54087) As classification now works for multiple classes, randomly picking training/test data frame rows is not good enough. This commit introduces a stratified cross validation splitter that maintains the proportion of the each class in the dataset in the sample that is used for training the model. Backport of elastic#54087
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dimitris-athanasiou
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As classification now works for multiple classes, randomly
picking training/test data frame rows is not good enough.
This commit introduces a stratified cross validation splitter
that maintains the proportion of the each class in the dataset
in the sample that is used for training the model.
Backport of #54087