php-ml/tests/NeuralNetwork/Node/Neuron/SynapseTest.php
2019-11-08 15:28:42 +01:00

54 lines
1.4 KiB
PHP

<?php
declare(strict_types=1);
namespace Phpml\Tests\NeuralNetwork\Node\Neuron;
use Phpml\NeuralNetwork\Node\Neuron;
use Phpml\NeuralNetwork\Node\Neuron\Synapse;
use PHPUnit\Framework\MockObject\MockObject;
use PHPUnit\Framework\TestCase;
class SynapseTest extends TestCase
{
public function testSynapseInitialization(): void
{
$node = $this->getNodeMock($nodeOutput = 0.5);
$synapse = new Synapse($node, $weight = 0.75);
self::assertEquals($node, $synapse->getNode());
self::assertEquals($weight, $synapse->getWeight());
self::assertEquals($weight * $nodeOutput, $synapse->getOutput());
$synapse = new Synapse($node);
$weight = $synapse->getWeight();
self::assertTrue($weight === -1. || $weight === 1.);
}
public function testSynapseWeightChange(): void
{
$node = $this->getNodeMock();
$synapse = new Synapse($node, $weight = 0.75);
$synapse->changeWeight(1.0);
self::assertEquals(1.75, $synapse->getWeight());
$synapse->changeWeight(-2.0);
self::assertEquals(-0.25, $synapse->getWeight());
}
/**
* @return Neuron|MockObject
*/
private function getNodeMock(float $output = 1.)
{
$node = $this->getMockBuilder(Neuron::class)->getMock();
$node->method('getOutput')->willReturn($output);
return $node;
}
}