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#' @title Fuzzy Analysis Clustering Learner
#'
#' @name mlr_learners_clust.fanny
#' @include LearnerClust.R
#' @include aaa.R
#'
#' @description
#' A [LearnerClust] for fuzzy clustering implemented in [cluster::fanny()].
#' [cluster::fanny()] doesn't have a default value for the number of clusters.
#' Therefore, the `k` parameter which corresponds to the number
#' of clusters here is set to 2 by default.
#' The predict method copies cluster assignments and memberships
#' generated for train data. The predict does not work for
#' new data.
#'
#' @templateVar id clust.fanny
#' @template learner
#' @template example
#'
#' @export
LearnerClustFanny = R6Class("LearnerClustFanny",
inherit = LearnerClust,
public = list(
#' @description
#' Creates a new instance of this [R6][R6::R6Class] class.
initialize = function() {
ps = ps(
k = p_int(lower = 1L, default = 2L, tags = c("required", "train")),
memb.exp = p_dbl(lower = 1L, default = 2L, tags = "train"),
metric = p_fct(default = "euclidean", levels = c("euclidean", "manhattan", "SqEuclidean"), tags = "train"),
stand = p_lgl(default = FALSE, tags = "train"),
maxit = p_int(lower = 0L, default = 500L, tags = "train"),
tol = p_dbl(lower = 0L, default = 1e-15, tags = "train"),
trace.lev = p_int(lower = 0L, default = 0L, tags = "train")
)
ps$values = list(k = 2L)
super$initialize(
id = "clust.fanny",
feature_types = c("logical", "integer", "numeric"),
predict_types = c("partition", "prob"),
param_set = ps,
properties = c("partitional", "fuzzy", "complete"),
packages = "cluster",
man = "mlr3cluster::mlr_learners_clust.fanny",
label = "Fuzzy Analysis Clustering"
)
}
),
private = list(
.train = function(task) {
pv = self$param_set$get_values(tags = "train")
m = invoke(cluster::fanny, x = task$data(), .args = pv)
if (self$save_assignments) {
self$assignments = m$clustering
}
return(m)
},
.predict = function(task) {
warn_prediction_useless(self$id)
partition = self$model$clustering
prob = self$model$membership
colnames(prob) = seq_len(ncol(prob))
PredictionClust$new(task = task, partition = partition, prob = prob)
}
)
)
learners[["clust.fanny"]] = LearnerClustFanny
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