org.apache.ignite.ml.util.genetic

Class Population

java.lang.Object

org.apache.ignite.ml.util.genetic.Population

public class Population
extends Object

Represents a populations of chromosomes.

Constructor Summary

Constructors

Constructor and Description
Population(int size)

Method Summary

Modifier and Type	Method and Description
void	calculateFitnessForAll(Function<Chromosome,Double> fitnessFunction) Calculates fintness for all chromosomes with custom fitness function.
double	calculateFitnessForChromosome(int idx, Function<Chromosome,Double> fitnessFunction) Calculates fitness for chromosome found by index with custom fitness function.
double	getAverageFitness() Returns the average fitness of population or Double.NaN if not all fitnesses are calculated for all chromosomes.
Chromosome	getChromosome(int idx) Returns an individual chromosome.
Chromosome	getChromosome(Integer idx) Returns the chromosome by given index.
double	getTotalFitness() Returns the total fitness value of population or Double.NaN if not all fitnesses are calculated for all chromosomes.
Chromosome[]	selectBestKChromosome(int k) Selects the top K chromosomes by fitness value from the smallest to the largest.
void	setChromosome(int idx, Chromosome chromosome) Sets the chromsome for given index.
void	setFitness(Integer idx, Double fitness) Sets the fitness value for chromosome with the given index.
int	size() Returns the size of population.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

Population

public Population(int size)

Parameters:

size - Size.

Method Detail

getChromosome

public Chromosome getChromosome(int idx)

Returns an individual chromosome.

Parameters:

idx - Index of chromosome.

calculateFitnessForChromosome

public double calculateFitnessForChromosome(int idx,
                                            Function<Chromosome,Double> fitnessFunction)

Calculates fitness for chromosome found by index with custom fitness function.

Parameters:

idx - Index.

fitnessFunction - Fitness function.

calculateFitnessForAll

public void calculateFitnessForAll(Function<Chromosome,Double> fitnessFunction)

Calculates fintness for all chromosomes with custom fitness function.

Parameters:

fitnessFunction - Fitness function.

setChromosome

public void setChromosome(int idx,
                          Chromosome chromosome)

Sets the chromsome for given index.

Parameters:

idx - Index.

chromosome - Chromosome.

getChromosome

public Chromosome getChromosome(Integer idx)

Returns the chromosome by given index.

Parameters:

idx - Index.

selectBestKChromosome

public Chromosome[] selectBestKChromosome(int k)

Selects the top K chromosomes by fitness value from the smallest to the largest.

Parameters:

k - The amount of top chromosome with highest value of the fitness. Returns null if not all fitnesses are calculated for all chromosomes.

getTotalFitness

public double getTotalFitness()

Returns the total fitness value of population or Double.NaN if not all fitnesses are calculated for all chromosomes.

getAverageFitness

public double getAverageFitness()

Returns the average fitness of population or Double.NaN if not all fitnesses are calculated for all chromosomes.

size

public int size()

Returns the size of population.

setFitness

public void setFitness(Integer idx,
                       Double fitness)

Sets the fitness value for chromosome with the given index.

Parameters:

idx - Index.

fitness - Fitness.