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#' @title Density Learner
#'
#' @description
#' This Learner specializes [Learner] for density estimation problems:
#'
#' * `task_type` is set to `"dens"`
#' * Creates [Prediction]s of class [PredictionDens].
#' * Possible values for `predict_types` are:
#' - `"pdf"`: Evaluates estimated probability density function for each value in the test set.
#' - `"cdf"`: Evaluates estimated cumulative distribution function for each value in the test set.
#'
#' @template param_id
#' @template param_param_set
#' @template param_predict_types
#' @template param_feature_types
#' @template param_learner_properties
#' @template param_data_formats
#' @template param_packages
#' @template param_label
#' @template param_man
#'
#' @family Learner
#' @export
#' @examples
#' library(mlr3)
#' # get all density learners from mlr_learners:
#' lrns = mlr_learners$mget(mlr_learners$keys("^dens"))
#' names(lrns)
#'
#' # get a specific learner from mlr_learners:
#' mlr_learners$get("dens.hist")
#' lrn("dens.hist")
LearnerDens = R6::R6Class("LearnerDens",
inherit = Learner,
public = list(
#' @description Creates a new instance of this [R6][R6::R6Class] class.
initialize = function(id, param_set = ps(),
predict_types = "cdf", feature_types = character(),
properties = character(), data_formats = "data.table",
packages = character(),
label = NA_character_,
man = NA_character_) {
super$initialize(
id = id, task_type = "dens", param_set = param_set,
predict_types = predict_types, feature_types = feature_types, properties = properties,
data_formats = data_formats, packages = c("mlr3proba", packages), label = label, man = man)
}
)
)
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