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lib/Algorithm/MasterMind/Evolutionary.pm  view on Meta::CPAN

package Algorithm::MasterMind::Evolutionary;

use warnings;
use strict;
use Carp;

use lib qw(../../lib ../../../../Algorithm-Evolutionary/lib/ 
	   ../../../lib
	   ../../Algorithm-Evolutionary/lib/);

our $VERSION =   sprintf "%d.%03d", q$Revision: 1.8 $ =~ /(\d+)\.(\d+)/g; 

use base 'Algorithm::MasterMind::Evolutionary_Base';

use Algorithm::Evolutionary::Op::String_Mutation; 
use Algorithm::Evolutionary::Op::Permutation; 
use Algorithm::Evolutionary::Op::Uniform_Crossover;
use Algorithm::Evolutionary::Op::Easy;
use Algorithm::Evolutionary::Individual::String;

# ---------------------------------------------------------------------------


sub initialize {
  my $self = shift;
  my $options = shift;
  for my $o ( keys %$options ) {
    $self->{"_$o"} = $options->{$o};
  }

  # Variation operators
  my $m = new Algorithm::Evolutionary::Op::String_Mutation; # Rate = 1
  my $p = new Algorithm::Evolutionary::Op::Permutation; # Rate = 1
  my $crossover_probability = 0.5;
  my $crossover_rate = 3;
  my $c = Algorithm::Evolutionary::Op::Uniform_Crossover->new( $crossover_probability,
							       $crossover_rate ); 

  my $fitness = sub { $self->fitness_orig(@_) };
  my $ga = new Algorithm::Evolutionary::Op::Easy( $fitness, 
						  $options->{'replacement_rate'},
						  [ $m, $p, $c] );
  $self->{'_fitness'} = $fitness;
  $self->{'_ga'} = $ga;

}


sub issue_next {
  my $self = shift;
  my $rules =  $self->number_of_rules();
  my @alphabet = @{$self->{'_alphabet'}};
  my $length = $self->{'_length'};
  my $pop = $self->{'_pop'};
  my $ga = $self->{'_ga'};
  map( $_->evaluate( $self->{'_fitness'}), @$pop );
  my @ranked_pop = sort { $b->{_fitness} <=> $a->{_fitness}; } @$pop;

  if ( $ranked_pop[0]->{'_matches'} == $rules ) { #Already found!
    return  $self->{'_last'} = $ranked_pop[0]->{'_str'};
  } else {
    my @pop_by_matches;
    my $best;
    do {
      $ga->apply( $pop );
      print "Población ", scalar @$pop, "\n";
      map( $_->{'_matches'} = $_->{'_matches'}?$_->{'_matches'}:-1, @$pop ); #To avoid warnings