Population::GaScalingOperation Class Reference

This class is interface for scaling operations which transform chromosomes' fitness values. More...

#include <D:/Temp/vs/gal/source/PopulationOperations.h>

Inherits Common::GaOperation.

Inherited by Population::ScalingOperations::GaExponentialScaling, Population::ScalingOperations::GaLinearScaling, Population::ScalingOperations::GaNormalizationScaling, and Population::ScalingOperations::GaWindowScaling.

List of all members.

Public Member Functions

virtual float GACALL operator() (const GaScaledChromosome &chromosome, const GaPopulation &population, const GaScalingParams &parameters) const =0
 operator () performs scaling operation and returns scaled fitness value.
virtual bool GACALL IsRankingBased () const =0
 IsRankingBased method should return true if scaling of fitness value is based on ranking of chromosome in population.
virtual bool GACALL NeedRescaling (const GaPopulation &population, const GaScalingParams &parameters) const =0
 NeedRescaling method checks current population for consistence of chromosomes' scaled fitness values.


Detailed Description

This class is interface for scaling operations which transform chromosomes' fitness values.

This class has no built-in synchronizator, so LOCK_OBJECT and LOCK_THIS_OBJECT macros cannot be used with instances of this class. No public or private methods are thread-safe.


Member Function Documentation

virtual float GACALL Population::GaScalingOperation::operator() ( const GaScaledChromosome chromosome,
const GaPopulation population,
const GaScalingParams parameters 
) const [pure virtual]

operator () performs scaling operation and returns scaled fitness value.

Parameters:
chromosome reference to chromosome which fitness is scaled.
population reference to population which hosts specified chromosome.
parameters reference to parameters of scaling operation.
Returns:
Method returns scaled fitness.

Implemented in Population::ScalingOperations::GaWindowScaling, Population::ScalingOperations::GaExponentialScaling, Population::ScalingOperations::GaLinearScaling, and Population::ScalingOperations::GaNormalizationScaling.

virtual bool GACALL Population::GaScalingOperation::IsRankingBased (  )  const [pure virtual]

IsRankingBased method should return true if scaling of fitness value is based on ranking of chromosome in population.

Returns:
Method returns true if scaling operation scales chromosome's fitness based on its ranking in population. If ranking is not used in scaling method should return false.

Implemented in Population::ScalingOperations::GaWindowScaling, Population::ScalingOperations::GaExponentialScaling, Population::ScalingOperations::GaLinearScaling, and Population::ScalingOperations::GaNormalizationScaling.

virtual bool GACALL Population::GaScalingOperation::NeedRescaling ( const GaPopulation population,
const GaScalingParams parameters 
) const [pure virtual]

NeedRescaling method checks current population for consistence of chromosomes' scaled fitness values.

Parameters:
population reference to population which is checked.
parameters reference to parameters of scaling operation.
Returns:
Method returns false if all scaled fitness values of chromosomes are consistent. If rescaling of some or all chromosomes in population should be done, method returns true.

Implemented in Population::ScalingOperations::GaWindowScaling, Population::ScalingOperations::GaExponentialScaling, Population::ScalingOperations::GaLinearScaling, and Population::ScalingOperations::GaNormalizationScaling.


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

Genetic Algorithm Library
Coolsoft Software Development