Enhanced PHP File Manager

⬆️ Go Up (..)

📊 Server Information

Server:

Apache

System:

Linux 5.14.0-427.33.1.el9_4.x86_64

PHP Version:

7.4.33

User:

infinio

Directory:

/home/infinio/public_html/moodle/lib/mlbackend/php/phpml/src/Phpml/Clustering

Free Space:

250.28 GB

🔧 Quick Actions

✏️ Editing: DBSCAN.php

<?php

declare(strict_types=1);

namespace Phpml\Clustering;

use Phpml\Math\Distance;
use Phpml\Math\Distance\Euclidean;

class DBSCAN implements Clusterer
{
    private const NOISE = -1;

/**
     * @var float
     */
    private $epsilon;

/**
     * @var int
     */
    private $minSamples;

/**
     * @var Distance
     */
    private $distanceMetric;

public function __construct(float $epsilon = 0.5, int $minSamples = 3, ?Distance $distanceMetric = null)
    {
        if ($distanceMetric === null) {
            $distanceMetric = new Euclidean();
        }

$this->epsilon = $epsilon;
        $this->minSamples = $minSamples;
        $this->distanceMetric = $distanceMetric;
    }

public function cluster(array $samples): array
    {
        $labels = [];
        $n = 0;

foreach ($samples as $index => $sample) {
            if (isset($labels[$index])) {
                continue;
            }

$neighborIndices = $this->getIndicesInRegion($sample, $samples);

if (count($neighborIndices) < $this->minSamples) {
                $labels[$index] = self::NOISE;

continue;
            }

$labels[$index] = $n;

$this->expandCluster($samples, $neighborIndices, $labels, $n);

++$n;
        }

return $this->groupByCluster($samples, $labels, $n);
    }

private function expandCluster(array $samples, array $seeds, array &$labels, int $n): void
    {
        while (($index = array_pop($seeds)) !== null) {
            if (isset($labels[$index])) {
                if ($labels[$index] === self::NOISE) {
                    $labels[$index] = $n;
                }

continue;
            }

$labels[$index] = $n;

$sample = $samples[$index];
            $neighborIndices = $this->getIndicesInRegion($sample, $samples);

if (count($neighborIndices) >= $this->minSamples) {
                $seeds = array_unique(array_merge($seeds, $neighborIndices));
            }
        }
    }

private function getIndicesInRegion(array $center, array $samples): array
    {
        $indices = [];

foreach ($samples as $index => $sample) {
            if ($this->distanceMetric->distance($center, $sample) < $this->epsilon) {
                $indices[] = $index;
            }
        }

return $indices;
    }

private function groupByCluster(array $samples, array $labels, int $n): array
    {
        $clusters = array_fill(0, $n, []);

foreach ($samples as $index => $sample) {
            if ($labels[$index] !== self::NOISE) {
                $clusters[$labels[$index]][$index] = $sample;
            }
        }

// Reindex (i.e. to 0, 1, 2, ...) integer indices for backword compatibility
        foreach ($clusters as $index => $cluster) {
            $clusters[$index] = array_merge($cluster, []);
        }

return $clusters;
    }
}

❌ Cancel

🗂️ Enhanced PHP File Manager

📊 Server Information

🔧 Quick Actions

✏️ Editing: DBSCAN.php

📤 Upload File

📁 Create Folder

📄 Create File

✏️ Rename Item

🗑️ Delete Confirmation