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