#' @param average (`character(1)`)\cr
#' How to average multiple [mlr3::Prediction]s from a [ResampleResult].
#'
#' The default, `"macro"`, calculates the individual performances scores for each [mlr3::Prediction] and then uses the
#' function defined in `$aggregator` to average them to a single number.
#'
#' If set to `"micro"`, the individual [mlr3::Prediction] objects are first combined into a single new [mlr3::Prediction] object which is then used to assess the performance.
#' The function in `$aggregator` is not used in this case.
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