#' @title Classification AdaBoostM1 Learner
#'
#' @name mlr_learners_classif.AdaBoostM1
#'
#' @description
#' A [mlr3::LearnerClassif] implementing classification AdaBoostM1 from package \CRANpkg{RWeka}.
# Calls [RWeka::AdaBoostM1()].
#'
#' @section Custom mlr3 defaults:
#' - `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
#'
#' @templateVar id classif.AdaBoostM1
#' @template section_dictionary_learner
#'
#' @references
#' Freund Y, Schapire, R (1993).
#' Experiments with a New Boosting Algorithm
#' \url{http://citeseerx.ist.psu.edu/viewdoc/download?doi=10.1.1.51.6252&rep=rep1&type=pdf}
#'
#' @export
LearnerClassifAdaBoostM1 = R6Class("LearnerClassifAdaBoostM1",
inherit = LearnerClassif,
public = list(
#' @description
#' Creates a new instance of this [R6][R6::R6Class] class.
initialize = function() {
ps = ParamSet$new(
params = list(
ParamUty$new(id = "subset", tags = c("train", "pars")),
ParamUty$new(id = "na.action", tags = c("train", "pars")),
ParamInt$new(
id = "P", default = 100L, lower = 90L, upper = 100L,
tags = c("train", "control")),
ParamLgl$new(id = "Q", default = FALSE, tags = c("train", "control")),
ParamInt$new(id = "S", default = 1L, lower = 1L, tags = c("train", "control")),
ParamInt$new(id = "I", default = 10L, lower = 1L, tags = c("train", "control")),
ParamUty$new(
id = "W", default = "weka.classifiers.trees.DecisionStump",
tags = c("train", "control")),
ParamLgl$new(id = "output_debug_info", default = FALSE, tags = c("train", "control")),
ParamLgl$new(
id = "do_not_check_capabilities", default = FALSE,
tags = c("train", "control")),
ParamInt$new(
id = "num_decimal_places", default = 2L, lower = 1L,
tags = c("train", "control")),
ParamInt$new(id = "batch_size", default = 100L, lower = 1L, tags = c("train", "control")),
ParamUty$new(id = "options", default = NULL, tags = c("train", "pars"))
)
)
super$initialize(
id = "classif.AdaBoostM1",
packages = "RWeka",
feature_types = c("numeric", "factor", "ordered"),
predict_types = c("response", "prob"),
param_set = ps,
properties = c("twoclass", "multiclass"),
man = "mlr3learners.rweka::mlr_learners_classif.AdaBoostM1"
)
}
),
private = list(
.train = function(task) {
ctrl = self$param_set$get_values(tags = "control")
if (length(ctrl) > 0L) {
names(ctrl) = gsub("_", replacement = "-", x = names(ctrl))
ctrl = mlr3misc::invoke(RWeka::Weka_control, ctrl)
}
pars = self$param_set$get_values(tags = "pars")
f = task$formula()
data = task$data()
mlr3misc::invoke(RWeka::AdaBoostM1, formula = f, data = data, control = ctrl, .args = pars)
},
.predict = function(task) {
response = NULL
prob = NULL
newdata = task$data(cols = task$feature_names)
if (self$predict_type == "response") {
response = mlr3misc::invoke(predict, self$model, newdata = newdata, type = "class")
} else {
prob = mlr3misc::invoke(predict, self$model, newdata = newdata, type = "prob")
}
PredictionClassif$new(task = task, response = response, prob = prob)
}
)
)
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