Created by Scott Robert Ladd at Coyote Gulch Productions.
Fitness scaling for a population. More...
#include <scaler.h>
Public Member Functions | |
virtual | ~scaler () |
Virtual destructor. More... | |
virtual void | scale_fitness (vector< OrganismType > &a_population)=0 |
Scale a population's fitness values. More... | |
Additional Inherited Members | |
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static size_t | rand_index (size_t n) |
Static function to allow use of g_random function pointer in random_shuffle. | |
static void | set_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. | |
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static prng | g_random |
A shared random number generator. | |
static std::string | g_version |
Version number. | |
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.
OrganismType | - The type of organism |
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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.
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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.
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 >, libevocosm::linear_norm_scaler< libevocosm::function_solution >, and libevocosm::null_scaler< OrganismType >.
© 1996-2005 Scott Robert Ladd. All rights reserved.
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