56 lines
990 B
PHP
56 lines
990 B
PHP
<?php
|
|
|
|
declare(strict_types=1);
|
|
|
|
namespace Phpml\NeuralNetwork\Node\Neuron;
|
|
|
|
use Phpml\NeuralNetwork\Node;
|
|
|
|
class Synapse
|
|
{
|
|
/**
|
|
* @var float
|
|
*/
|
|
protected $weight;
|
|
|
|
/**
|
|
* @var Node
|
|
*/
|
|
protected $node;
|
|
|
|
/**
|
|
* @param Node $node
|
|
* @param float|null $weight
|
|
*/
|
|
public function __construct(Node $node, float $weight = null)
|
|
{
|
|
$this->node = $node;
|
|
$this->weight = $weight ?: $this->generateRandomWeight();
|
|
}
|
|
|
|
protected function generateRandomWeight() : float
|
|
{
|
|
return 1 / random_int(5, 25) * (random_int(0, 1) ? -1 : 1);
|
|
}
|
|
|
|
public function getOutput() : float
|
|
{
|
|
return $this->weight * $this->node->getOutput();
|
|
}
|
|
|
|
public function changeWeight(float $delta)
|
|
{
|
|
$this->weight += $delta;
|
|
}
|
|
|
|
public function getWeight() : float
|
|
{
|
|
return $this->weight;
|
|
}
|
|
|
|
public function getNode(): Node
|
|
{
|
|
return $this->node;
|
|
}
|
|
}
|