bdelespierre / php-kmeans
K-Means algorithm for PHP
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Requires
- php: ^7.3|^8.0
Requires (Dev)
- phpunit/phpunit: ^9.3
README
K-mean clustering algorithm implementation in PHP.
Please also see the FAQ
Installation
You can install the package via composer:
composer require bdelespierre/php-kmeans
Usage
require "vendor/autoload.php"; // prepare 50 points of 2D space to be clustered $points = [ [80,55],[86,59],[19,85],[41,47],[57,58], [76,22],[94,60],[13,93],[90,48],[52,54], [62,46],[88,44],[85,24],[63,14],[51,40], [75,31],[86,62],[81,95],[47,22],[43,95], [71,19],[17,65],[69,21],[59,60],[59,12], [15,22],[49,93],[56,35],[18,20],[39,59], [50,15],[81,36],[67,62],[32,15],[75,65], [10,47],[75,18],[13,45],[30,62],[95,79], [64,11],[92,14],[94,49],[39,13],[60,68], [62,10],[74,44],[37,42],[97,60],[47,73], ]; // create a 2-dimentions space $space = new KMeans\Space(2); // add points to space foreach ($points as $i => $coordinates) { $space->addPoint($coordinates); } // cluster these 50 points in 3 clusters $clusters = $space->solve(3); // display the cluster centers and attached points foreach ($clusters as $num => $cluster) { $coordinates = $cluster->getCoordinates(); printf( "Cluster %s [%d,%d]: %d points\n", $num, $coordinates[0], $coordinates[1], count($cluster) ); }
Note: the example is given with points of a 2D space but it will work with any dimention >1.
Testing
composer test
Changelog
Please see CHANGELOG for more information what has changed recently.
Contributing
Please see CONTRIBUTING for details.
Security
If you discover any security related issues, please email benjamin.delespierre@gmail.com instead of using the issue tracker.
Credits
License
Lesser General Public License (LGPL). Please see License File for more information.
FAQ
How to get coordinates of a point/cluster:
$x = $point[0]; $y = $point[1]; // or list($x,$y) = $point->getCoordinates();
List all points of a space/cluster:
foreach ($cluster as $point) { printf('[%d,%d]', $point[0], $point[1]); }
Attach data to a point:
$point = $space->addPoint([$x, $y, $z], "user #123");
Retrieve point data:
$data = $space[$point]; // e.g. "user #123"
Watch the algorithm run
Each iteration step can be monitored using a callback function passed to Kmeans\Space::solve
:
$clusters = $space->solve(3, function($space, $clusters) { static $iterations = 0; printf("Iteration: %d\n", ++$iterations); foreach ($clusters as $i => $cluster) { printf("Cluster %d [%d,%d]: %d points\n", $i, $cluster[0], $cluster[1], count($cluster)); } });