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Class to terminate the optimization after the performance stagnates, i.e. does not improve more than threshold over the last n batches.

Dictionary

This Terminator can be instantiated via the dictionary mlr_terminators or with the associated sugar function trm():

mlr_terminators$get("stagnation_batch")
trm("stagnation_batch")

Parameters

n

integer(1)
Number of batches to evaluate the performance improvement on, default is 1.

threshold

numeric(1)
If the improvement is less than threshold, optimization is stopped, default is 0.

Super class

bbotk::Terminator -> TerminatorStagnationBatch

Methods

Inherited methods


Method new()

Creates a new instance of this R6 class.


Method is_terminated()

Is TRUE iff the termination criterion is positive, and FALSE otherwise.

Usage

TerminatorStagnationBatch$is_terminated(archive)

Arguments

archive

(Archive).

Returns

logical(1).


Method clone()

The objects of this class are cloneable with this method.

Usage

TerminatorStagnationBatch$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

TerminatorStagnationBatch$new()
#> <TerminatorStagnationBatch>
#> * Parameters: n=1, threshold=0
trm("stagnation_batch", n = 1, threshold = 1e-5)
#> <TerminatorStagnationBatch>
#> * Parameters: n=1, threshold=1e-05