php-ml/tests/Classification/DecisionTree/DecisionTreeLeafTest.php

51 lines
1.6 KiB
PHP

<?php
declare(strict_types=1);
namespace Phpml\Tests\Classification\DecisionTree;
use Phpml\Classification\DecisionTree\DecisionTreeLeaf;
use PHPUnit\Framework\TestCase;
class DecisionTreeLeafTest extends TestCase
{
public function testHTMLOutput(): void
{
$leaf = new DecisionTreeLeaf();
$leaf->value = 1;
$leaf->columnIndex = 0;
$rightLeaf = new DecisionTreeLeaf();
$rightLeaf->value = '<= 2';
$rightLeaf->columnIndex = 1;
$leaf->rightLeaf = $rightLeaf;
$this->assertEquals('<table ><tr><td colspan=3 align=center style=\'border:1px solid;\'><b>col_0 =1</b><br>Gini: 0.00</td></tr><tr><td></td><td>&nbsp;</td><td valign=top align=right><b>No |</b><br><table ><tr><td colspan=3 align=center style=\'border:1px solid;\'><b>col_1 <= 2</b><br>Gini: 0.00</td></tr></table></td></tr></table>', $leaf->getHTML());
}
public function testNodeImpurityDecreaseShouldBeZeroWhenLeafIsTerminal(): void
{
$leaf = new DecisionTreeLeaf();
$leaf->isTerminal = true;
$this->assertEquals(0.0, $leaf->getNodeImpurityDecrease(1));
}
public function testNodeImpurityDecrease(): void
{
$leaf = new DecisionTreeLeaf();
$leaf->giniIndex = 0.5;
$leaf->records = [1, 2, 3];
$leaf->leftLeaf = new DecisionTreeLeaf();
$leaf->leftLeaf->records = [5, 2];
$leaf->rightLeaf = new DecisionTreeLeaf();
$leaf->rightLeaf->records = [];
$leaf->rightLeaf->giniIndex = 0.3;
$this->assertSame(0.75, $leaf->getNodeImpurityDecrease(2));
}
}