The Mutation structure that encapsulates the mutation operation and its configuration in evolutionary algorithm. More...

#include <Mutation.hh>

Public Types
enum	MutationSelectionType { MutationSelectionType::ITERATE_AND_TEST_P, MutationSelectionType::SELECT_P_OF_N }
	Predefined ways in which individuals are selected from the population for mutation. Please refer to enum values for details about each of them. More...

Public Member Functions
	Mutation (double mutationPhaseRate=1.0, double mutateIndividualRate=0.09, double mutateChromosomeRate=0.5, bool mutateBothParentsAndChildren=true, std::mt19937_64::result_type seed=std::random_device{}())
	Mutation - Constructor. More...

virtual void	Perform (const std::vector< std::unique_ptr< EvoScript >> &parentPopulation, const std::vector< std::unique_ptr< EvoScript >> &childrenPopulation)
	Perform - Attempts to mutate the entire population. The umber of individuals mutates is based on mutation phase rate and mutate individual rate. More...

Public Attributes
std::vector< std::unique_ptr< EvoScript > >	populationAfter {}

double	MutationPhaseRate = 0.0
	Probability of a mutation phase to happen (globally). If a mutation is included in the algorithm, this value should most likely be equal to 1.0.

double	MutateIndividualRate = 0.0
	Probability that an individual will be considered for mutation (randomResolutionTypeForIndividual == ITERATE_AND_TEST_P); or the portion of individuals chosen for mutation (randomResolutionTypeForIndividual == SELECT_P_OF_N).

double	MutateChromosomeRate = 0.0
	Probability that a chromosome of an individual will be considered for mutation (randomResolutionTypeForChromosome == ITERATE_AND_TEST_P); or the portion of chromosomes within an individual chosen for mutation (randomResolutionTypeForChromosome == SELECT_P_OF_N).

bool	MutateBothParentsAndChildren = false
	If true: both the previous population and children can be mutated; if false: only the individuals after crossover can be mutated.

Protected Member Functions
virtual void	MutateIndividual (EvoScript &individual)

virtual void	MutateChromosome (EvoScript &individual, EvoParam &chromosome)

Protected Attributes
std::mt19937_64	randGen

MutationSelectionType	RandomResolutionTypeForIndividual = MutationSelectionType::SELECT_P_OF_N

MutationSelectionType	RandomResolutionTypeForChromosome = MutationSelectionType::SELECT_P_OF_N

Detailed Description

The Mutation structure that encapsulates the mutation operation and its configuration in evolutionary algorithm.

Member Enumeration Documentation

strong

Predefined ways in which individuals are selected from the population for mutation. Please refer to enum values for details about each of them.

Enumerator
ITERATE_AND_TEST_P	ITERATE_AND_TEST_P -
SELECT_P_OF_N	SELECT_P_OF_N -

grail::evolution::Mutation::Mutation	(	double	mutationPhaseRate = `1.0`,
		double	mutateIndividualRate = `0.09`,
		double	mutateChromosomeRate = `0.5`,
		bool	mutateBothParentsAndChildren = `true`,
		std::mt19937_64::result_type	seed = `std::random_device{}()`
	)

Mutation - Constructor.

Parameters

mutationPhaseRate	- probability of a mutation phase to happen (globally). If a mutation is included in the algorithm, this value should most likely be equal to 1.0.
mutateIndividualRate	-Probability that an individual will be considered for mutation (randomResolutionTypeForIndividual == ITERATE_AND_TEST_P); or the portion of individuals chosen for mutation (randomResolutionTypeForIndividual == SELECT_P_OF_N).
mutateChromosomeRate	- probability that a chromosome of an individual will be considered for mutation (randomResolutionTypeForChromosome == ITERATE_AND_TEST_P); or the portion of chromosomes within an individual chosen for mutation (randomResolutionTypeForChromosome == SELECT_P_OF_N).
mutateBothParentsAndChildren	- if true: both the previous population and children can be mutated; if false: only the individuals after crossover can be mutated.
seed	- initial seed for random numbers generator.

void grail::evolution::Mutation::Perform	(	const std::vector< std::unique_ptr< EvoScript >> &	parentPopulation,
		const std::vector< std::unique_ptr< EvoScript >> &	childrenPopulation
	)

virtual

Perform - Attempts to mutate the entire population. The umber of individuals mutates is based on mutation phase rate and mutate individual rate.

Parameters

parentPopulation	Parent population - before the mutation.
childrenPopulation	Children population - after the mutation.

The documentation for this struct was generated from the following files: