#' @param log.fun [\code{function} | \code{character(1)}]\cr
#' Function used for logging. If set to \dQuote{default} (the default), the evaluated design points, the resulting
#' performances, and the runtime will be reported.
#' If set to \dQuote{memory}, the memory usage for each evaluation will also be displayed, with a small increase
#' in run time.
#' Otherwise a function with arguments \code{learner}, \code{resampling}, \code{measures},
#' \code{par.set}, \code{control}, \code{opt.path}, \code{dob}, \code{x}, \code{y}, \code{remove.nas},
#' \code{stage}, and \code{prev.stage} is expected.
#' The default displays the performance measures, the time needed for evaluating,
#' the currently used memory and the max memory ever used before
#' (the latter two both taken from \code{\link{gc}}).
#' See the implementation for details.
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