The Perl and Raku Conference 2025: Greenville, South Carolina - June 27-29 Learn more

JMERELO / Algorithm-Evolutionary-0.56 / lib / Algorithm / Evolutionary / Fitness / Base.pm 

            

              
1
2
—
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
—
28
29
30
31
32
33
34
35
36
37
38
39
40
41
—
42
43
44
45
46
47
48
49
50
51
52
53
—
54
55
56
57
58
59
60
61
62
63
64
65
66
67
—
68
69
70
71
72
73
74
75
76
77
78
79
—
80
81
82
83
84
85
86
87
88
89
90
91
—
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128

              
use strict;
use warnings;
=head1 NAME
    Algorithm::Evolutionary::Fitness::Base - Base class for Fitness functions
=head1 SYNOPSIS
Shouldn't be used directly, it's an abstract class whose siblings are
used to implement fitness functions
=head1 DESCRIPTION
Has functionality that should be common to all fitness. Or at least it
would be nice to have it in common
=head1 METHODS
=cut
package Algorithm::Evolutionary::Fitness::Base;
use Carp;
our ($VERSION) = ( '$Revision: 1.4 $ ' =~ /(\d+\.\d+)/ );
=head2 new()
Initializes common variables, like the number of evaluations
=cut 
sub new {
  my $class = shift;
  my $self = {};
  bless $self, $class;
  $self->initialize();
  return $self;
}
=head2 initialize()
Called from new, initializes the evaluations counter. 
=cut 
sub initialize {
  my $self = shift;
  $self->{_counter} = 0; 
}
=head2 apply( $individual )
Applies the instantiated problem to a chromosome. Actually it is a
wrapper around C<_apply>
=cut
sub apply {
    my $self = shift;
    my $individual = shift;
    $self->{'_counter'}++;
    return $self->_apply( $individual );
}
=head2 _apply( $individual )
This is the one that really does the stuff. Should be overloaded by
derived clases
=cut
sub _apply {
  carp "You should have overloaded this\n";
}
=head2 evaluations() 
Returns the number of evaluations made with this object. Useful for
collecting stats
=cut
sub evaluations {
  my $self = shift;
  return $self->{_counter};
}
=head1 Known subclasses
=over 4
=item * 
L<Algorithm::Evolutionary::Fitness::MMDP>
=item * 
L<Algorithm::Evolutionary::Fitness::P_Peaks>
=item * 
L<Algorithm::Evolutionary::Fitness::wP_Peaks>
=item * 
L<Algorithm::Evolutionary::Fitness::Knapsack>
=back
=head1 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: 2008/06/18 17:18:11 $ 
  $Header: /cvsroot/opeal/Algorithm-Evolutionary/lib/Algorithm/Evolutionary/Fitness/Base.pm,v 1.4 2008/06/18 17:18:11 jmerelo Exp $ 
  $Author: jmerelo $ 
  $Revision: 1.4 $
  $Name $
=cut
"What???";