Random Selector

Random selector that disregards fitness and individual values and selects individuals randomly. Depending on the configuration parameter replace, it samples with or without replacement.

Configuration Parameters

• sample_unique :: character(1)
  Whether to sample individuals globally unique ("global"), unique within groups ("groups"), or not unique at all ("no", sample with replacement). This is done with best effort; if group_size (when sample_unique is "groups") or n_select (when sample_unique is "global") is greater than nrow(values), then individuals are selected with as few repeats as possible. Initialized to "groups".

Supported Operand Types

Supported Param classes are: ParamLgl, ParamInt, ParamDbl, ParamFct

Dictionary

This Selector can be created with the short access form sel() (sels() to get a list), or through the the dictionary dict_selectors in the following way:

# preferred:
sel("random")
sels("random")  # takes vector IDs, returns list of Selectors

# long form:
dict_selectors$get("random")

See also

Other selectors: SelectorScalar, Selector, dict_selectors_best, dict_selectors_maybe, dict_selectors_null, dict_selectors_proxy, dict_selectors_sequential, dict_selectors_tournament

Super classes

miesmuschel::MiesOperator -> miesmuschel::Selector -> SelectorRandom

Methods

Public methods

• SelectorRandom$new()

• SelectorRandom$clone()

Inherited methods

• miesmuschel::MiesOperator$help()
• miesmuschel::MiesOperator$operate()
• miesmuschel::MiesOperator$prime()
• miesmuschel::MiesOperator$print()
• miesmuschel::MiesOperator$repr()

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Method new()

Initialize the SelectorRandom object.

Usage

SelectorRandom$new()

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Method clone()

The objects of this class are cloneable with this method.

Usage

SelectorRandom$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

Examples

set.seed(1)
sr = sel("random")
p = ps(x = p_dbl(-5, 5))
# dummy data; note that SelectorRandom does not depend on data content
data = data.frame(x = rep(0, 5))
fitnesses = c(1, 5, 2, 3, 0)

sr$prime(p)

sr$operate(data, fitnesses, 2)
#> [1] 1 4
sr$operate(data, fitnesses, 2)
#> [1] 1 2
sr$operate(data, fitnesses, 2)
#> [1] 5 3

sr$operate(data, fitnesses, 4)
#> [1] 2 3 3 1
sr$operate(data, fitnesses, 4)
#> [1] 5 5 2 2
sr$operate(data, fitnesses, 4)
#> [1] 1 5 5 1