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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