Base class representing recombination operations, inheriting from MiesOperator.
Recombinators get a table of individuals as input and return a table of modified individuals as output. Individuals are acted on by
groups: every $n_indivs_out lines of output corresponds to a group of $n_indivs_in lines of input, and presence or absence
of other input groups does not affect the result.
Recombination operations are performed in ES algorithms to facilitate exploration of the search space that combine partial solutions.
Recombinator is an abstract base class and should be inherited from. Inheriting classes should implement the private $.recombine()
function. The user of the object calls $operate(), which calls $.recombine() for each $n_indivs_in sized group of individuals after checking that
the operator is primed, that the values argument conforms to the primed domain. $.recombine() should then return a table of
$n_indivs_out individuals for each call. Typically, the $initialize() function
should also be overloaded, and optionally the $prime() function; they should call their super equivalents.
Other base classes:
Filtor,
FiltorSurrogate,
MiesOperator,
Mutator,
MutatorDiscrete,
MutatorNumeric,
OperatorCombination,
RecombinatorPair,
Scalor,
Selector,
SelectorScalar
Other recombinators:
OperatorCombination,
RecombinatorPair,
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::MiesOperator -> Recombinator
n_indivs_in(integer(1))
Number of individuals to consider at the same time. When operating, the number of input individuals must be divisible by this number.
n_indivs_out(integer(1))
Number of individuals produced for each group of $n_indivs_in individuals.
new()Initialize base class components of the Recombinator.
Recombinator$new(
param_classes = c("ParamLgl", "ParamInt", "ParamDbl", "ParamFct"),
param_set = ps(),
n_indivs_in = 2,
n_indivs_out = n_indivs_in,
packages = character(0),
dict_entry = NULL,
own_param_set = quote(self$param_set)
)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.
n_indivs_in(integer(1))
Number of individuals to consider at the same time. When operating, the number of input individuals must be divisible by this number.
Default 2.
The $n_indivs_in field will reflect this value.
n_indivs_out(integer(1))
Number of individuals that result for each n_indivs_in lines of input. The number of results from the recombinator will be
nrow(values) / n_indivs_in * n_indivs_out. Default equal to n_indivs_in.
The $n_indivs_out 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.