#' @param obj [(list of) \code{\link{Prediction}} | (list of) \code{\link{ResampleResult}} | \code{\link{BenchmarkResult}}]\cr
#'   Single prediction object, list of them, single resample result, list of them, or a benchmark result.
#'   In case of a list probably produced by different learners you want to compare, then
#'   name the list with the names you want to see in the plots, probably
#'   learner shortnames or ids.
