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<?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 float|null $weight
public function __construct(Node $node, ?float $weight = null)
$this->node = $node;
$this->weight = $weight ?? $this->generateRandomWeight();
}
public function getOutput(): float
return $this->weight * $this->node->getOutput();
public function changeWeight(float $delta): void
$this->weight += $delta;
public function getWeight(): float
return $this->weight;
public function getNode(): Node
return $this->node;
protected function generateRandomWeight(): float
return (1 / random_int(5, 25) * random_int(0, 1)) > 0 ? -1 : 1;
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