<?php
/*
Genetic Algorithm without evolution goal?
*/
require __DIR__ . '/../vendor/autoload.php'; // composer autoload
class CustomGeneticAlgorithm extends \SimpleGeneticAlgorithm\SimpleGeneticAlgorithm{
// make it blank
public function fitness_function(){ }
// just random selection
public function selection(){
foreach($this->population as $k => $v){
if(rand(0, 1) == 0){
unset($this->population[$k]);
}
}
}
// just leave crossover to parents
// make randrom mutation on 1 chromosome
public function mutation(){
$chars = str_split($this->options['seed']);
foreach($this->population as $k => $v){
$tmp = str_split($v['chromosome']);
$key = array_rand($tmp);
$tmp[$key] = $chars[rand(0, count($chars) - 1)];
$this->population[$k]['chromosome'] = implode($tmp);
}
}
}
$ga = new CustomGeneticAlgorithm(array(
'seed' => 'abcdefghijklmnopqrstuvwxyz',
'goal' => 'aa',
'delay' => 10, // ms, if debug is false, then delay forced to 0
'debug' => true,
));
$ga->run(); // hmm hardly find a goal
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