jaga.evolve
Class LockingExactGenotypeMutator

java.lang.Object
  |
  +--jaga.evolve.LockingExactGenotypeMutator

All Implemented Interfaces:

GeneticOperator, java.io.Serializable

public class LockingExactGenotypeMutator

extends java.lang.Object

implements GeneticOperator

This Genetic Operator will look at the bits of the elite through generations and record the last time they changed. This 'age' of the bits is used to modify the probability of them being mutated.

The probability of being mutated is modified in the following way:

If a bit is selected for mutation, then the probability of this mutation being rejected (and another picked later) is calculated as 1/(age/alpha+1) where age is the number of generations since this selected bit was last mutated and alpha is the half-life, which is the age at which we expect 1/2 chance of rejection. For example if alpha=1000 then after 1000 generations with a bit not having changed, if it is chosen for mutation there is a half-half chance it will be rejected and another chosen instead.

See Also:

Serialized Form

Constructor Summary

LockingExactGenotypeMutator(int mutsPerGen, int halfLife)
Creates new LockingExactGenotypeMutator

Method Summary

void	operate(Selector selector, Population oldPopulation, Population newPopulation, int howMany) method that adds genotypes to the new population by extracting some from the old one and manipulating them in some way.
java.lang.String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Detail

LockingExactGenotypeMutator

public LockingExactGenotypeMutator(int mutsPerGen,
                                   int halfLife)

Creates new LockingExactGenotypeMutator

Method Detail

operate

public void operate(Selector selector,
                    Population oldPopulation,
                    Population newPopulation,
                    int howMany)

method that adds genotypes to the new population by extracting some from the old one and manipulating them in some way.

Specified by:

operate in interface GeneticOperator

Parameters:

oldPopulation - in parameter having all the original genotypes

newPopulation - in/out parameter where the next generation of genotypes is being built

howMany - how many new genotypes to add to the new population

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object