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J. J. Merelo-Guervós > Algorithm-Evolutionary-0.79_1 > Algorithm::Evolutionary::Op::Breeder

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Module Version: 1.4   Source   Latest Release: Algorithm-Evolutionary-0.80

NAME ^

Algorithm::Evolutionary::Op::Breeder - Even more customizable single generation for an evolutionary algorithm.

SYNOPSIS ^

    use Algorithm::Evolutionary qw( Individual::BitString 
    Op::Mutation Op::Crossover
    Op::RouletteWheel
    Op::Breeder);

    use Algorithm::Evolutionary::Utils qw(average);

    my @pop;
    my $number_of_bits = 20;
    my $population_size = 20;
    my $replacement_rate = 0.5;
    for ( 1..$population_size ) {
      my $indi = new Algorithm::Evolutionary::Individual::BitString $number_of_bits ; #Creates random individual
      $indi->evaluate( $onemax );
      push( @pop, $indi );
    }

    my $m =  new Algorithm::Evolutionary::Op::Mutation 0.5;
    my $c = new Algorithm::Evolutionary::Op::Crossover; #Classical 2-point crossover

    my $selector = new Algorithm::Evolutionary::Op::RouletteWheel $population_size; #One of the possible selectors

    my $generation = 
      new Algorithm::Evolutionary::Op::Breeder( $selector, [$m, $c] );

    my @sortPop = sort { $b->Fitness() <=> $a->Fitness() } @pop;
    my $bestIndi = $sortPop[0];
    my $previous_average = average( \@sortPop );
    $generation->apply( \@sortPop );

Base Class ^

Algorithm::Evolutionary::Op::Base

DESCRIPTION ^

Breeder part of the evolutionary algorithm; takes a population and returns another created from the first

METHODS ^

new( $ref_to_operator_array[, $selector = new Algorithm::Evolutionary::Op::Tournament_Selection 2 ] )

Creates a breeder, with a selector and array of operators

apply( $population[, $how_many || $population_size] )

Applies the algorithm to the population, which should have been evaluated first; checks that it receives a ref-to-array as input, croaks if it does not. Returns a sorted, culled, evaluated population for next generation.

SEE ALSO ^

More or less in the same ballpark, alternatives to this one

Copyright ^

  This file is released under the GPL. See the LICENSE file included in this distribution,
  or go to http://www.fsf.org/licenses/gpl.txt

  CVS Info: $Date: 2013/01/05 12:54:48 $ 
  $Header: /media/Backup/Repos/opeal/opeal/Algorithm-Evolutionary/lib/Algorithm/Evolutionary/Op/Breeder.pm,v 1.4 2013/01/05 12:54:48 jmerelo Exp $ 
  $Author: jmerelo $ 
  $Revision: 1.4 $
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