RecombinatorPair: Pair Recombinator Base Class

In miesmuschel: Mixed Integer Evolution Strategies

Pair Recombinator Base Class

Description

Base class for recombination that covers the common case of combining two individuals, where two (typically complementary) child individuals could be taken as the result, such as bitwise crossover or SBX crossover.

This is a relatively lightweight class, it adds the keep_complement active binding and sets ⁠$n_indivs_in⁠ and ⁠$n_indivs_out⁠ appropriately.

Inheriting

RecombinatorPair is an abstract base class and should be inherited from. Inheriting classes should implement the private ⁠$.recombine_pair()⁠ function. During ⁠$operate()⁠, the ⁠$.recombine_pair()⁠ function is called with the same input as the ⁠$.recombine()⁠ function of the Recombinator class. It should return a data.table of two individuals.

Constructors of inheriting classes should have a keep_complement argument.

Super classes

miesmuschel::MiesOperator -> miesmuschel::Recombinator -> RecombinatorPair

Active bindings

keep_complement

(logical(1))
Whether the operation keeps both resulting individuals of the operation or discards the complement.

Methods

Public methods

• RecombinatorPair$new()

• RecombinatorPair$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 base class components of the RecombinatorPair.

Usage

RecombinatorPair$new(
  keep_complement = TRUE,
  param_classes = c("ParamLgl", "ParamInt", "ParamDbl", "ParamFct"),
  param_set = ps(),
  packages = character(0),
  dict_entry = NULL,
  own_param_set = quote(self$param_set)
)

Arguments

keep_complement

(logical(1))
Whether the operation should keep both resulting individuals (TRUE), or only the first and discard the complement (FALSE). Default TRUE. The ⁠$keep_complement⁠ field will reflect this value.

param_classes

(character)
Classes of parameters that the operator can handle. May contain any of "ParamLgl", "ParamInt", "ParamDbl", "ParamFct". Default is all of them.
The ⁠$param_classes⁠ field will reflect this value.

param_set

(ParamSet | list of expression)
Strategy parameters of the operator. This should be created by the subclass and given to super$initialize(). If this is a ParamSet, it is used as the MiesOperator's ParamSet directly. Otherwise it must be a list of expressions e.g. created by alist() that evaluate to ParamSets, possibly referencing self and private. These ParamSet are then combined using a ParamSetCollection. Default is the empty ParamSet.
The ⁠$param_set⁠ field will reflect this value.

packages

(character) Packages that need to be loaded for the operator to function. This should be declared so these packages can be loaded when operators run on parallel instances. Default is character(0).
The ⁠$packages⁠ field will reflect this values.

dict_entry

(character(1) | NULL)
Key of the class inside the Dictionary (usually one of dict_mutators, dict_recombinators, dict_selectors), where it can be retrieved using a short access function. May be NULL if the operator is not entered in a dictionary.
The ⁠$dict_entry⁠ field will reflect this value.

own_param_set

(language)
An expression that evaluates to a ParamSet indicating the configuration parameters that are entirely owned by this operator class (and not proxied from a construction argument object). This should be quote(self$param_set) (the default) when the param_set argument is not a list of expressions.

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Method clone()

The objects of this class are cloneable with this method.

Usage

RecombinatorPair$clone(deep = FALSE)

Arguments

deep

Whether to make a deep clone.

See Also

Other base classes: Filtor, FiltorSurrogate, MiesOperator, Mutator, MutatorDiscrete, MutatorNumeric, OperatorCombination, Recombinator, Scalor, Selector, SelectorScalar

Other recombinators: OperatorCombination, Recombinator, dict_recombinators_cmpmaybe, dict_recombinators_convex, dict_recombinators_cvxpair, dict_recombinators_maybe, dict_recombinators_null, dict_recombinators_proxy, dict_recombinators_sbx, dict_recombinators_sequential, dict_recombinators_swap, dict_recombinators_xonary, dict_recombinators_xounif

miesmuschel documentation built on Sept. 11, 2024, 8:23 p.m.