#' @title Classification J48 Learner
#' @author henrifnk
#' @name mlr_learners_classif.J48
#'
#' @description
#' Decision tree algorithm.
#' Calls [RWeka::IBk()] from \CRANpkg{RWeka}.
#'
#' @template learner
#' @templateVar id classif.J48
#'
#' @section Custom mlr3 parameters:
#' - `output_debug_info`:
#' - original id: output-debug-info
#'
#' - `do_not_check_capabilities`:
#' - original id: do-not-check-capabilities
#'
#' - `num_decimal_places`:
#' - original id: num-decimal-places
#'
#' - `batch_size`:
#' - original id: batch-size
#'
#' - Reason for change: This learner contains changed ids of the following control arguments
#' since their ids contain irregular pattern
#'
#' @references
#' `r format_bib("quinlan2014c4")`
#'
#' @template seealso_learner
#' @template example
#' @export
LearnerClassifJ48 = R6Class("LearnerClassifJ48",
inherit = LearnerClassif,
public = list(
#' @description
#' Creates a new instance of this [R6][R6::R6Class] class.
initialize = function() {
ps = ps(
subset = p_uty(tags = "train"),
na.action = p_uty(tags = "train"),
U = p_lgl(default = FALSE, tags = "train"),
O = p_lgl(default = FALSE, tags = "train"),
C = p_dbl(default = 0.25, lower = .Machine$double.eps,
upper = 1 - .Machine$double.eps, tags = "train"),
M = p_int(default = 2L, lower = 1L, tags = "train"),
R = p_lgl(default = FALSE, tags = "train"),
N = p_int(default = 3L, lower = 2L, tags = "train"),
B = p_lgl(default = FALSE, tags = "train"),
S = p_lgl(default = FALSE, tags = "train"),
L = p_lgl(default = FALSE, tags = "train"),
A = p_lgl(default = FALSE, tags = "train"),
J = p_lgl(default = FALSE, tags = "train"),
Q = p_int(default = 1L, lower = 1L, tags = "train"),
doNotMakeSplitPointActualValue = p_lgl(default = FALSE,
tags = "train"),
output_debug_info = p_lgl(default = FALSE, tags = "train"),
do_not_check_capabilities = p_lgl(default = FALSE,
tags = "train"),
num_decimal_places = p_int(default = 2L, lower = 1L,
tags = "train"),
batch_size = p_int(default = 100L, lower = 1L, tags = "train"),
options = p_uty(default = NULL, tags = "train")
)
ps$add_dep("C", "U", CondEqual$new(FALSE))
ps$add_dep("C", "R", CondEqual$new(FALSE))
ps$add_dep("R", "U", CondEqual$new(FALSE))
ps$add_dep("N", "U", CondEqual$new(FALSE))
ps$add_dep("N", "R", CondEqual$new(TRUE))
ps$add_dep("S", "U", CondEqual$new(FALSE))
super$initialize(
id = "classif.J48",
packages = c("mlr3extralearners", "RWeka"),
feature_types = c("numeric", "factor", "ordered", "integer"),
predict_types = c("response", "prob"),
param_set = ps,
properties = c("twoclass", "multiclass", "missings"),
man = "mlr3extralearners::mlr_learners_classif.J48",
label = "Tree-based Model"
)
}
),
private = list(
.train = function(task) {
weka_learner = RWeka::J48
pars = self$param_set$get_values(tags = "train")
rweka_train(task$data(), task$formula(), pars, weka_learner)
},
.predict = function(task) {
pars = self$param_set$get_values(tags = "predict")
newdata = ordered_features(task, self)
rweka_predict(newdata, pars, self$predict_type, self$model)
}
)
)
.extralrns_dict$add("classif.J48", LearnerClassifJ48)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.