Fold Helpers

Accessors and indexers for the different parts of a fold.

training(x = NULL, fold = NULL)

validation(x = NULL, fold = NULL)

fold_index(x = NULL, fold = NULL)

Arguments

x	an object to be indexed by a training set, validation set, or fold index. If missing, the index itself will be returned.
fold	Fold; the fold used to do the indexing. If missing, `fold` will be pulled from the calling environment, if available.

The elements of x corresponding to the indexes, or the indexes themselves if x is missing.