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#' @title Regression Task
#'
#' @include TaskSupervised.R
#'
#' @description
#' This task specializes [Task] and [TaskSupervised] for regression problems.
#' The target column is assumed to be numeric.
#' The `task_type` is set to `"regr"`.
#'
#' It is recommended to use [as_task_regr()] for construction.
#' Predefined tasks are stored in the [dictionary][mlr3misc::Dictionary] [mlr_tasks].
#'
#' @template param_rows
#' @template param_id
#' @template param_backend
#'
#' @template seealso_task
#' @export
#' @examples
#' task = as_task_regr(palmerpenguins::penguins, target = "bill_length_mm")
#' task$task_type
#' task$formula()
#' task$truth()
#' task$data(rows = 1:3, cols = task$feature_names[1:2])
TaskRegr = R6Class("TaskRegr",
inherit = TaskSupervised,
public = list(
#' @description
#' Creates a new instance of this [R6][R6::R6Class] class.
#' The function [as_task_regr()] provides an alternative way to construct regression tasks.
#'
#' @template param_target
#' @template param_label
#' @template param_extra_args
initialize = function(id, backend, target, label = NA_character_, extra_args = list()) {
assert_string(target)
super$initialize(
id = id, task_type = "regr", backend = backend,
target = target, label = label, extra_args = extra_args)
type = fget(self$col_info, i = target, j = "type", key = "id")
if (type %nin% c("integer", "numeric")) {
stopf("Target column '%s' must be numeric", target)
}
},
#' @description
#' True response for specified `row_ids`. Format depends on the task type.
#' Defaults to all rows with role "use".
#' @return `numeric()`.
truth = function(rows = NULL) {
super$truth(rows)[[1L]]
}
)
)
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