Github user MLnick commented on a diff in the pull request: https://github.com/apache/spark/pull/13894#discussion_r69281183 --- Diff: mllib/src/main/scala/org/apache/spark/ml/tuning/CrossValidator.scala --- @@ -56,7 +56,10 @@ private[ml] trait CrossValidatorParams extends ValidatorParams { /** * :: Experimental :: - * K-fold cross validation. + * CrossValidator begins by splitting the dataset into a set of non-overlapping randomly + * partitioned folds which are used as separate training and test datasets e.g., with k=3 folds, + * CrossValidator will generate 3 (training, test) dataset pairs, each of which uses 2/3 of + * the data for training and 1/3 for testing. Each fold is used in the testing set exactly once. --- End diff -- "used in the testing set" -> "used as the test set"
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