mlr3 (version 0.12.0)

mlr_resamplings_subsampling: Subsampling Resampling

Description

Splits data repeats (default: 30) times into training and test set with a ratio of ratio (default: 2/3) observations going into the training set.

Dictionary

This Resampling can be instantiated via the dictionary mlr_resamplings or with the associated sugar function rsmp():

mlr_resamplings$get("holdout")
rsmp("holdout")

Parameters

• repeats (integer(1)) Number of repetitions.

• ratio (numeric(1)) Ratio of observations to put into the training set.

Super class

mlr3::Resampling -> ResamplingSubsampling

Active bindings

iters

(integer(1)) Returns the number of resampling iterations, depending on the values stored in the param_set.

Methods

Public methods

• ResamplingSubsampling$new()

• ResamplingSubsampling$clone()

• mlr3::Resampling$format()

• mlr3::Resampling$help()

• mlr3::Resampling$instantiate()

• mlr3::Resampling$print()

• mlr3::Resampling$test_set()

• mlr3::Resampling$train_set()

Method new()

Creates a new instance of this R6 class.

Usage

ResamplingSubsampling$new()

Method clone()

The objects of this class are cloneable with this method.

Usage

ResamplingSubsampling$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

References

Bischl B, Mersmann O, Trautmann H, Weihs C (2012). “Resampling Methods for Meta-Model Validation with Recommendations for Evolutionary Computation.” Evolutionary Computation, 20(2), 249--275. 10.1162/evco_a_00069.

See Also

• Chapter in the mlr3book: https://mlr3book.mlr-org.com/resampling.html

• Package mlr3spatiotempcv for spatio-temporal resamplings.

• Dictionary of Resamplings: mlr_resamplings

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

Other Resampling: Resampling, mlr_resamplings_bootstrap, mlr_resamplings_custom_cv, mlr_resamplings_custom, mlr_resamplings_cv, mlr_resamplings_holdout, mlr_resamplings_insample, mlr_resamplings_loo, mlr_resamplings_repeated_cv, mlr_resamplings

Examples

# NOT RUN {
# Create a task with 10 observations
task = tsk("penguins")
task$filter(1:10)

# Instantiate Resampling
subsampling = rsmp("subsampling", repeats = 2, ratio = 0.5)
subsampling$instantiate(task)

# Individual sets:
subsampling$train_set(1)
subsampling$test_set(1)

# Disjunct sets:
intersect(subsampling$train_set(1), subsampling$test_set(1))

# Internal storage:
subsampling$instance$train # list of index vectors
# }