#' @title Density Smoothing Splines Learner
#' @author RaphaelS1
#' @name mlr_learners_dens.spline
#'
#' @description
#' Density Smoothing Splines Learner.
#' Calls [gss::ssden()] from \CRANpkg{gss}.
#'
#' @template learner
#' @templateVar id dens.spline
#'
#' @references
#' `r format_bib("gu2003penalized")`
#'
#' @template seealso_learner
#' @template example
#' @export
LearnerDensSpline = R6Class("LearnerDensSpline",
inherit = mlr3proba::LearnerDens,
public = list(
#' @description
#' Creates a new instance of this [R6][R6::R6Class] class.
initialize = function() {
ps = ps(
type = p_uty(tags = "train"),
alpha = p_dbl(default = 1.4, tags = "train"),
weights = p_uty(tags = "train"),
na.action = p_uty(default = stats::na.omit, tags = "train"),
id.basis = p_uty(tags = "train"),
nbasis = p_int(tags = "train"),
seed = p_dbl(tags = "train"),
domain = p_uty(tags = "train"),
quad = p_uty(tags = "train"),
qdsz.depth = p_dbl(tags = "train"),
bias = p_uty(tags = "train"),
prec = p_dbl(default = 1e-7, tags = "train"),
maxiter = p_int(default = 30, lower = 1, tags = "train"),
skip.iter = p_lgl(tags = "train")
)
super$initialize(
id = "dens.spline",
packages = c("mlr3extralearners", "gss"),
feature_types = c("integer", "numeric"),
predict_types = c("pdf", "cdf"),
param_set = ps,
properties = "missings",
man = "mlr3extralearners::mlr_learners_dens.spline",
label = "Density Smoothing Splines"
)
}
),
private = list(
.train = function(task) {
pars = self$param_set$get_values(tags = "train")
data = task$data()[[1]]
fit = invoke(gss::ssden, formula = ~data, .args = pars)
pdf = function(x) {} # nolint
body(pdf) = substitute({
invoke(gss::dssden, object = fit, x = x)
})
cdf = function(x) {} # nolint
body(cdf) = substitute({
invoke(gss::pssden, object = fit, q = x)
})
quantile = function(p) {} # nolint
body(quantile) = substitute({
invoke(gss::qssden, object = fit, p = p)
})
distr6::Distribution$new(
name = "Smoothing Spline Density Estimator",
short_name = "splineDens",
pdf = pdf, cdf = cdf, quantile = quantile, type = set6::Reals$new())
},
.predict = function(task) {
newdata = task$data()[[1]]
pars = self$param_set$get_values(tags = "predict")
invoke(list, pdf = self$model$pdf(newdata), cdf = self$model$cdf(newdata), .args = pars)
}
)
)
.extralrns_dict$add("dens.spline", LearnerDensSpline)
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