mlr_resamplings_custom function

Custom Resampling

Splits data into training and test sets using manually provided indices.

Dictionary

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

mlr_resamplings$get("custom")
rsmp("custom")

Examples

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

# Instantiate Resampling
custom = rsmp("custom")
train_sets = list(1:5, 5:10)
test_sets = list(5:10, 1:5)
custom$instantiate(task, train_sets, test_sets)

custom$train_set(1)
custom$test_set(1)

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_cv, mlr_resamplings_cv, mlr_resamplings_holdout, mlr_resamplings_insample, mlr_resamplings_loo, mlr_resamplings_repeated_cv, mlr_resamplings_subsampling

Super class

mlr3::Resampling -> ResamplingCustom

Active bindings

• iters: (integer(1))

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

Methods

Public methods

• list("ResamplingCustom$new()")

• list("ResamplingCustom$instantiate()")

• list("ResamplingCustom$clone()")

Method new()

Creates a new instance of this R6 class.

Usage

ResamplingCustom$new()

Method instantiate()

Instantiate this Resampling with custom splits into training and test set.

Usage

ResamplingCustom$instantiate(task, train_sets, test_sets)

Arguments

• task: Task

   Mainly used to check if `train_sets` and `test_sets` are feasible.
  

• train_sets: (list of integer())

   List with row ids for training, one list element per iteration. Must have the same length as `test_sets`.
  

• test_sets: (list of integer())

   List with row ids for testing, one list element per iteration. Must have the same length as `train_sets`.
  

Method clone()

The objects of this class are cloneable with this method.

Usage

ResamplingCustom$clone(deep = FALSE)

Arguments

• deep: Whether to make a deep clone.