libevocosm::scaler< OrganismType > Class Template Reference

Fitness scaling for a population. More...

#include <scaler.h>

Inheritance diagram for libevocosm::scaler< OrganismType >:

Public Member Functions
virtual	~scaler ()
	Virtual destructor. More...
virtual void	scale_fitness (vector< OrganismType > &a_population)=0
	Scale a population's fitness values. More...
void	invert (vector< OrganismType > &a_population)
	Invert a population's fitness values. More...

Additional Inherited Members
Static Protected Member Functions inherited from libevocosm::globals
static size_t	rand_index (size_t n)
	Static function to allow use of g_random function pointer in random_shuffle.
static void	set_random_seed (uint32_t a_seed)
	Set the seed for the random number generator.
static uint32_t	get_seed ()
	Set the seed for the random number generator.
static std::string	version ()
	Get version number.
Static Protected Attributes inherited from libevocosm::globals
static prng	g_random
	A shared random number generator.
static std::string	g_version
	Version number.

Detailed Description

template<class OrganismType>
class libevocosm::scaler< OrganismType >

As a population converges on a definitive solution, the difference between fitness values may become very small. That prevents the best solutions from having a significant advantage in reproduction. Fitness scaling solves this problem by adjusting the fitness values to the advantage of the most-fit chromosomes.

Parameters

OrganismType

- The type of organism

Constructor & Destructor Documentation

template<class OrganismType>

virtual libevocosm::scaler< OrganismType >::~scaler ( )

inlinevirtual

A virtual destructor. By default, it does nothing; this is a placeholder that identifies this class as a potential base, ensuring that objects of a derived class will have their destructors called if they are destroyed through a base-class pointer.

Member Function Documentation

template<class OrganismType>

void libevocosm::scaler< OrganismType >::invert ( vector< OrganismType > &  a_population )

inline

Scales a population's fitness values

References libevocosm::organism< Genotype >::fitness().

template<class OrganismType>

virtual void libevocosm::scaler< OrganismType >::scale_fitness ( vector< OrganismType > &  a_population )

pure virtual

The scale_fitness method can adjust the fitness of a population to make it more likely that the "best" (whatever that menas) organisms have the best chance of reproduction.

Parameters

a_population

- A population of organisms

Implemented in libevocosm::sigma_scaler< OrganismType >, libevocosm::quadratic_scaler< OrganismType >, libevocosm::exponential_scaler< OrganismType >, libevocosm::windowed_scaler< OrganismType >, libevocosm::linear_norm_scaler< OrganismType >, and libevocosm::null_scaler< OrganismType >.

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

• scaler.h