feat: support for BIRCH and BICO learners

DESCRIPTION

@@ -37,6 +37,7 @@ Suggests:
     mclust,
     mlbench,
     RWeka,
+    stream,
     testthat (>= 3.0.0)
 Config/testthat/edition: 3
 Encoding: UTF-8
@@ -47,6 +48,8 @@ Collate:
     'aaa.R'
     'LearnerClustAffinityPropagation.R'
     'LearnerClustAgnes.R'
+    'LearnerClustBICO.R'
+    'LearnerClustBIRCH.R'
     'LearnerClustCMeans.R'
     'LearnerClustCobweb.R'
     'LearnerClustDBSCAN.R'

NAMESPACE

@@ -15,6 +15,8 @@ S3method(is_missing_prediction_data,PredictionDataClust)
 export(LearnerClust)
 export(LearnerClustAP)
 export(LearnerClustAgnes)
+export(LearnerClustBICO)
+export(LearnerClustBIRCH)
 export(LearnerClustCMeans)
 export(LearnerClustCobweb)
 export(LearnerClustDBSCAN)

NEWS.md

@@ -1,5 +1,8 @@
 # mlr3cluster (development version)
 
+* Add BIRCH learner from 'stream' package
+* Add BICO learner from 'stream' package
+
 # mlr3cluster 0.1.9
 
 * Add DBSCAN learner from 'fpc' package

R/LearnerClustBICO.R

@@ -0,0 +1,66 @@
+#' @title BICO Clustering Learner
+#'
+#' @name mlr_learners_clust.bico
+#'
+#' @description
+#' BICO (Fast computation of k-means coresets in a data stream) clustering.
+#' Calls [stream::DSC_BICO()] from \CRANpkg{stream}.
+#'
+#' @templateVar id clust.bico
+#' @template learner
+#'
+#' @references
+#' `r format_bib("fichtenberger2013bico", "hahsler2017stream")`
+#'
+#' @export
+#' @template seealso_learner
+#' @template example
+LearnerClustBICO = R6Class("LearnerClustBICO",
+  inherit = LearnerClust,
+  public = list(
+    #' @description
+    #' Creates a new instance of this [R6][R6::R6Class] class.
+    initialize = function() {
+      param_set = ps(
+        k = p_int(1L, default = 5L, tags = "train"),
+        space = p_int(1L, default = 10L, tags = "train"),
+        p = p_int(1L, default = 10L, tags = "train"),
+        iterations = p_int(1L, default = 10L, tags = "train")
+      )
+
+      super$initialize(
+        id = "clust.bico",
+        feature_types = c("integer", "numeric"),
+        predict_types = "partition",
+        param_set = param_set,
+        properties = c("partitional", "exclusive", "complete"),
+        packages = "stream",
+        man = "mlr3cluster::mlr_learners_clust.bico",
+        label = "BICO Clustering"
+      )
+    }
+  ),
+  private = list(
+    .train = function(task) {
+      pv = self$param_set$get_values(tags = "train")
+      dt = task$data()
+      m = invoke(stream::DSC_BICO, .args = pv)
+      x = stream::DSD_Memory(dt)
+      stats::update(m, x, n = nrow(dt))
+
+      if (self$save_assignments) {
+        self$assignments = as.integer(invoke(predict, m, newdata = dt)[[1L]])
+      }
+
+      return(m)
+    },
+
+    .predict = function(task) {
+      partition = as.integer(invoke(predict, self$model, newdata = task$data())[[1L]])
+      PredictionClust$new(task = task, partition = partition)
+    }
+  )
+)
+
+#' @include aaa.R
+learners[["clust.bico"]] = LearnerClustBICO

R/LearnerClustBIRCH.R

@@ -0,0 +1,67 @@
+#' @title BIRCH Clustering Learner
+#'
+#' @name mlr_learners_clust.birch
+#'
+#' @description
+#' BIRCH (Balanced Iterative Reducing Clustering using Hierarchies) clustering.
+#' Calls [stream::DSC_BIRCH()] from \CRANpkg{stream}.
+#'
+#' @templateVar id clust.birch
+#' @template learner
+#'
+#' @references
+#' `r format_bib("zhang1996birch", "zhang1997birch", "hahsler2017stream")`
+#'
+#' @export
+#' @template seealso_learner
+#' @template example
+LearnerClustBIRCH = R6Class("LearnerClustBIRCH",
+  inherit = LearnerClust,
+  public = list(
+    #' @description
+    #' Creates a new instance of this [R6][R6::R6Class] class.
+    initialize = function() {
+      param_set = ps(
+        threshold = p_dbl(0L, tags = c("train", "required")),
+        branching = p_int(1L, tags = c("train", "required")),
+        maxLeaf = p_int(1L, tags = c("train", "required")),
+        maxMem = p_int(0L, default = 0L, tags = "train"),
+        outlierThreshold = p_dbl(default = 0.25, tags = "train")
+      )
+
+      super$initialize(
+        id = "clust.birch",
+        feature_types = c("integer", "numeric"),
+        predict_types = "partition",
+        param_set = param_set,
+        properties = c("hierarchical", "exclusive", "complete"),
+        packages = "stream",
+        man = "mlr3cluster::mlr_learners_clust.birch",
+        label = "BIRCH Clustering"
+      )
+    }
+  ),
+  private = list(
+    .train = function(task) {
+      pv = self$param_set$get_values(tags = "train")
+      dt = task$data()
+      m = invoke(stream::DSC_BIRCH, .args = pv)
+      x = stream::DSD_Memory(dt)
+      stats::update(m, x, n = nrow(dt))
+
+      if (self$save_assignments) {
+        self$assignments = as.integer(invoke(predict, m, newdata = dt)[[1L]])
+      }
+
+      return(m)
+    },
+
+    .predict = function(task) {
+      partition = as.integer(invoke(predict, self$model, newdata = task$data())[[1L]])
+      PredictionClust$new(task = task, partition = partition)
+    }
+  )
+)
+
+#' @include aaa.R
+learners[["clust.birch"]] = LearnerClustBIRCH

R/bibentries.R

@@ -320,5 +320,42 @@ bibentries = c( # nolint start
     pages = "274--295",
     year = "2014",
     doi = "10.1007/s00357-014-9161-z"
+  ),
+  hahsler2017stream = bibentry("article",
+    title = "Introduction to {stream}: An Extensible Framework for Data Stream Clustering Research with {R}",
+    author = "Michael Hahsler and Matthew Bola\u00f1os and John Forrest",
+    journal = "Journal of Statistical Software",
+    year = "2017",
+    volume = "76",
+    number = "14",
+    pages = "1--50",
+    doi = "10.18637/jss.v076.i14",
+  ),
+  fichtenberger2013bico = bibentry("inproceedings",
+    title = "BICO: BIRCH Meets Coresets for k-Means Clustering",
+    author = "Fichtenberger, Hendrik and Gille, Marc and Schmidt, Melanie and Schwiegelshohn, Chris and Sohler, Christian",
+    booktitle = "Algorithms--ESA 2013: 21st Annual European Symposium, Sophia Antipolis, France, September 2-4, 2013. Proceedings 21",
+    pages = "481--492",
+    year = "2013",
+    organization = "Springer"
+  ),
+  zhang1996birch = bibentry("article",
+    title = "BIRCH: An Efficient Data Clustering Method for Very Large Databases",
+    author = "Zhang, Tian and Ramakrishnan, Raghu and Livny, Miron",
+    journal = "ACM sigmod record",
+    volume = "25",
+    number = "2",
+    pages = "103--114",
+    year = "1996",
+    publisher = "ACM New York, NY, USA"
+  ),
+  zhang1997birch = bibentry("article",
+    title = "BIRCH: A new data clustering algorithm and its applications",
+    author = "Zhang, Tian and Ramakrishnan, Raghu and Livny, Miron",
+    journal = "Data Mining and Knowledge Discovery",
+    volume = "1",
+    pages = "141--182",
+    year = "1997",
+    publisher = "Springer"
   )
 ) # nolint end

README.md

@@ -41,7 +41,7 @@ pak::pak("mlr-org/mlr3cluster")
 
 The current version of **mlr3cluster** contains:
 
-- A selection of 22 clustering learners that represent a wide variety of
+- A selection of 24 clustering learners that represent a wide variety of
   clusterers: partitional, hierarchical, fuzzy, etc.
 - A selection of 4 performance measures
 - Two built-in tasks to get started with clustering
@@ -60,6 +60,8 @@ create great visualizations with just one line of code!
 | [clust.SimpleKMeans](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.SimpleKMeans) | K-Means (Weka)                        | [RWeka](https://cran.r-project.org/package=RWeka)         |
 | [clust.agnes](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.agnes)               | Agglomerative Hierarchical Clustering | [cluster](https://cran.r-project.org/package=cluster)     |
 | [clust.ap](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.ap)                     | Affinity Propagation Clustering       | [apcluster](https://cran.r-project.org/package=apcluster) |
+| [clust.bico](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.bico)                 | BICO Clustering                       | [stream](https://cran.r-project.org/package=stream)       |
+| [clust.birch](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.birch)               | BIRCH Clustering                      | [stream](https://cran.r-project.org/package=stream)       |
 | [clust.cmeans](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.cmeans)             | Fuzzy C-Means Clustering Learner      | [e1071](https://cran.r-project.org/package=e1071)         |
 | [clust.cobweb](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.cobweb)             | Cobweb Clustering                     | [RWeka](https://cran.r-project.org/package=RWeka)         |
 | [clust.dbscan](https://mlr3cluster.mlr-org.com/reference/mlr_learners_clust.dbscan)             | Density-Based Clustering              | [dbscan](https://cran.r-project.org/package=dbscan)       |