mlr_resamplings_repeated_cv function

Repeated Cross-Validation Resampling

Splits data repeats (default: 10) times using a folds-fold (default: 10) cross-validation.

The iteration counter translates to repeats blocks of folds

cross-validations, i.e., the first folds iterations belong to a single cross-validation.

Iteration numbers can be translated into folds or repeats with provided methods.

Dictionary

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

mlr_resamplings$get("repeated_cv")
rsmp("repeated_cv")

Parameters

• repeats (integer(1))

  Number of repetitions.

• folds (integer(1))

  Number of folds.

Examples

# Create a task with 10 observations
task = tsk("penguins")
task$filter(1:10)

# Instantiate Resampling
repeated_cv = rsmp("repeated_cv", repeats = 2, folds = 3)
repeated_cv$instantiate(task)
repeated_cv$iters
repeated_cv$folds(1:6)
repeated_cv$repeats(1:6)

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

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

# Internal storage:
repeated_cv$instance # table

References

Bischl B, Mersmann O, Trautmann H, Weihs C (2012). Resampling Methods for Meta-Model Validation with Recommendations forEvolutionary Computation.

Evolutionary Computation, 20 (2), 249--275. tools:::Rd_expr_doi("10.1162/evco_a_00069") .

See Also

• Chapter in the mlr3book: https://mlr3book.mlr-org.com/chapters/chapter3/evaluation_and_benchmarking.html#sec-resampling
• Package list("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).
• list("mlr3spatiotempcv") for additional Resampling s for spatio-temporal tasks.

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

Super class

mlr3::Resampling -> ResamplingRepeatedCV

Active bindings

• iters: (integer(1))

   Returns the number of resampling iterations, depending on the values stored in the `param_set`.
  

Methods

Public methods

• list("ResamplingRepeatedCV$new()")

• list("ResamplingRepeatedCV$folds()")

• list("ResamplingRepeatedCV$repeats()")

• list("ResamplingRepeatedCV$clone()")

Method new()

Creates a new instance of this R6 class.

Usage

ResamplingRepeatedCV$new()

Method folds()

Translates iteration numbers to fold numbers.

Usage

ResamplingRepeatedCV$folds(iters)

Arguments

• iters: (integer())

   Iteration number.
  

Returns

integer() of fold numbers.

Method repeats()

Translates iteration numbers to repetition numbers.

Usage

ResamplingRepeatedCV$repeats(iters)

Arguments

• iters: (integer())

   Iteration number.
  

Returns

integer() of repetition numbers.

Method clone()

The objects of this class are cloneable with this method.

Usage

ResamplingRepeatedCV$clone(deep = FALSE)

Arguments

• deep: Whether to make a deep clone.