grail::evolution::FitnessRepository Class Reference

This class provides a functionality of assigning fitness values as averages from the previous evaluations.
It can be used to minimize the effects of variance when fitness calculation is non-deterministic.
Use 'AddSampleWithFitnessUpdate' method to store the current fitness and update it based on past evaluations. More...

#include <FitnessRepository.h>

Public Member Functions
	FitnessRepository (size_t maxSamplesPerIndividual=100)
	Constructs a new FitnessRepository instance. More...
std::size_t	GetSampleCount (const Individual &individual) const
	Returns the number of fitness values currently stored for a given individual. More...
bool	TryGetFitness (const Individual &individual, double &fitness) const
void	AddSampleWithFitnessUpdate (Individual &individual)
void	Serialize (const std::string &filename) const
	Serializes contents of the FitnessRepository so it can be loaded in another session using Deserialize(). . More...
bool	Deserialize (const std::string &filename, const Individual &populationRepresentative)
	Loads previously saved contents of the FitnessRepository using the Serialize() method. . More...

Detailed Description

This class provides a functionality of assigning fitness values as averages from the previous evaluations.
It can be used to minimize the effects of variance when fitness calculation is non-deterministic.
Use 'AddSampleWithFitnessUpdate' method to store the current fitness and update it based on past evaluations.

Constructor & Destructor Documentation

FitnessRepository()

grail::evolution::FitnessRepository::FitnessRepository

(

size_t

maxSamplesPerIndividual = 100

)

Constructs a new FitnessRepository instance.

Parameters

maxSamplesPerIndividual

- the number of fitness values to be stored per each individual.

Member Function Documentation

Deserialize()

bool grail::evolution::FitnessRepository::Deserialize	(	const std::string &	filename,
		const Individual &	populationRepresentative
	)

Loads previously saved contents of the FitnessRepository using the Serialize() method.
.

Parameters

filename	- the path where the state has been saved.
populationRepresentative	- an individual with the same structure (exact derived type) as the ones saved. It will be used for cloning purposes.

Returns

- a boolean value that tells if the deserialization was successful.

GetSampleCount()

std::size_t grail::evolution::FitnessRepository::GetSampleCount

(

const Individual &

individual

)

const

Returns the number of fitness values currently stored for a given individual.

Parameters

individual

= the given individual.

Returns

the number of fitness values currently stored for a given individual.

Serialize()

void grail::evolution::FitnessRepository::Serialize

(

const std::string &

filename

)

const

Serializes contents of the FitnessRepository so it can be loaded in another session using Deserialize().
.

Parameters

filename

- the path where the state will be saved. If the file exists, it will be overridden.

TryGetFitness()

bool grail::evolution::FitnessRepository::TryGetFitness	(	const Individual &	individual,
		double &	fitness
	)		const

Attempts to calculate the fitness value of an individual equal to the average value of the stored samples.

Parameters

individual	- the individual for which the fitness should be returned.
fitness	- the calculated fitness value or -1.0 if the method returns false.

Returns

- A boolean value stating whether fitness could have been computed (there was at least one stored sample).

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

• GrailEvolution/FitnessRepository.h
• GrailEvolution/FitnessRepository.cpp