Simplex Classification Task Generator

A TaskGenerator for the simplex task in mlbench::mlbench.simplex().

Note that the generator implemented in mlbench returns fewer samples than requested.

Dictionary

This TaskGenerator can be instantiated via the dictionary mlr_task_generators or with the associated sugar function tgen():

mlr_task_generators$get("simplex")
tgen("simplex")

Parameters

Id	Type	Default	Range	Levels
center	logical	TRUE	-	TRUE, FALSE
d	integer	3	\([1, \infty)\)	-
sd	numeric	0.1	\([0, \infty)\)	-
sides	integer	1	\([1, \infty)\)	-

See also

• Dictionary of TaskGenerators: mlr_task_generators

• as.data.table(mlr_task_generators) for a table of available TaskGenerators in the running session (depending on the loaded packages).

• Extension packages for additional task types:

  • mlr3proba for probabilistic supervised regression and survival analysis.

  • mlr3cluster for unsupervised clustering.

Other TaskGenerator: TaskGenerator, mlr_task_generators_2dnormals, mlr_task_generators_cassini, mlr_task_generators_circle, mlr_task_generators_friedman1, mlr_task_generators_moons, mlr_task_generators_smiley, mlr_task_generators_spirals, mlr_task_generators_xor, mlr_task_generators

Super class

mlr3::TaskGenerator -> TaskGeneratorSimplex

Methods

Public methods

• TaskGeneratorSimplex$new()

• TaskGeneratorSimplex$plot()

• TaskGeneratorSimplex$clone()

Inherited methods

• mlr3::TaskGenerator$format()

• mlr3::TaskGenerator$generate()

• mlr3::TaskGenerator$print()

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Method new()

Creates a new instance of this R6 class.

Usage

TaskGeneratorSimplex$new()

---

Method plot()

Creates a simple plot of generated data.

Usage

TaskGeneratorSimplex$plot(n = 200L, pch = 19L, ...)

Arguments

n

(integer(1))
Number of samples to draw for the plot. Default is 200.

pch

(integer(1))
Point char. Passed to plot().

...

(any)
Additional arguments passed to plot().

---

Method clone()

The objects of this class are cloneable with this method.

Usage

TaskGeneratorSimplex$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

generator = tgen("simplex")
plot(generator, n = 200)


task = generator$generate(200)
str(task$data())
#> Classes ‘data.table’ and 'data.frame':	100 obs. of  4 variables:
#>  $ y : Factor w/ 4 levels "A","B","C","D": 1 1 1 1 1 1 1 1 1 1 ...
#>  $ x1: num  -0.419 -0.54 -0.32 -0.646 -0.687 ...
#>  $ x2: num  0.0159 -0.423 -0.2558 -0.2757 -0.3722 ...
#>  $ x3: num  -0.1183 -0.0417 -0.2003 -0.1438 -0.1975 ...
#>  - attr(*, ".internal.selfref")=<externalptr>