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#' @title Create a Fallback Learner
#'
#' @description
#' Create a fallback learner for a given learner.
#' The function searches for a suitable fallback learner based on the task type.
#' Additional checks are performed to ensure that the fallback learner supports the predict type.
#'
#' @param learner [Learner]\cr
#' The learner for which a fallback learner should be created.
#' @param ... `any`\cr
#' ignored.
#'
#' @return [Learner]
default_fallback = function(learner, ...) {
UseMethod("default_fallback")
}
#' @rdname default_fallback
#' @export
default_fallback.Learner = function(learner, ...) {
# FIXME: remove when new encapsulate/fallback system is in place
return(NULL)
}
#' @rdname default_fallback
#' @export
default_fallback.LearnerClassif = function(learner, ...) {
fallback = lrn("classif.featureless")
# set predict type
if (learner$predict_type %nin% fallback$predict_types) {
stopf("Fallback learner '%s' does not support predict type '%s'.", fallback$id, learner$predict_type)
}
fallback$predict_type = learner$predict_type
return(fallback)
}
#' @rdname default_fallback
#' @export
default_fallback.LearnerRegr = function(learner, ...) {
fallback = lrn("regr.featureless")
# set predict type
if (learner$predict_type %nin% fallback$predict_types) {
stopf("Fallback learner '%s' does not support predict type '%s'.", fallback$id, learner$predict_type)
}
fallback$predict_type = learner$predict_type
# set quantiles
if (learner$predict_type == "quantiles") {
if (is.null(learner$quantiles) || is.null(learner$quantile_response)) {
stopf("Cannot set quantiles for fallback learner. Set `$quantiles` and `$quantile_response` in %s.", learner$id)
}
fallback$quantiles = learner$quantiles
fallback$quantile_response = learner$quantile_response
}
return(fallback)
}
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