#' @references
#' Guillaume Maillard, Sylvain Arlot, Matthieu Lerasle. "Aggregated hold-out".
#' Journal of Machine Learning Research 22(20):1--55, 2021.
#' @references
#' Guillaume Maillard, Sylvain Arlot, Matthieu Lerasle. "Aggregated hold-out".
#' Journal of Machine Learning Research 22(20):1--55, 2021.