NAME
Algorithm::Evolutionary::Op::Generation_Skeleton - Even more customizable single generation for an evolutionary algorithm.
SYNOPSIS
use Algorithm::Evolutionary qw( Individual::BitString
Op::Mutation Op::Crossover
Op::RouletteWheel
Fitness::ONEMAX Op::Generation_Skeleton
Op::Replace_Worst);
use Algorithm::Evolutionary::Utils qw(average);
my $onemax = new Algorithm::Evolutionary::Fitness::ONEMAX;
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::Generation_Skeleton( $onemax, $selector, [$m, $c], $replacement_rate );
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
Skeleton class for a general single-generation (or single step) in an evolutionary algorithm; its instantiation requires a fitness function, a Selector, a reference to an array of operators and a replacement operator
METHODS
new( $evaluation_function, $selector, $ref_to_operator_array, $replacement_operator )
Creates an algorithm, with no defaults except for the default replacement operator (defaults to Algorithm::Evolutionary::Op::ReplaceWorst)
set( $ref_to_params_hash, $ref_to_code_hash, $ref_to_operators_hash )
Sets the instance variables. Takes a ref-to-hash as input. Not intended to be used from outside the class
apply( $population )
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