# NOT RUN {
set.seed(28432)
fold_rs <- vfold_cv(mtcars)
fold_rs$splits[[1]]$out_id
complement(fold_rs$splits[[1]])
populate(fold_rs$splits[[1]])$out_id
fold_rs_all <- populate(fold_rs)
fold_rs_all$splits[[1]]$out_id
# }
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