Turn folds from 2K-fold cross-fitting into individual K-fold folds
make_kfold(
cross_fitting_folds,
sample_splitting_folds = rep(1, length(unique(cross_fitting_folds))),
C = rep(1, length(cross_fitting_folds))
)
the two sets of testing folds for K-fold cross-fitting
the vector of cross-fitting folds
the sample splitting folds
vector of whether or not we measured the observation in phase 2