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Example code of crwgregory/php-kmeans

Informations about the package php-kmeans

PHP K-Means

Clustering made simple

k-means clustering is a method of vector quantization, originally from signal processing, that is popular for cluster analysis in data mining. k-means clustering aims to partition n observations into k clusters in which each observation belongs to the cluster with the nearest mean, serving as a prototype of the cluster. This results in a partitioning of the data space into Voronoi cells.

Read more on Wikipedia

PHP K-Means, like its name suggest, is an implementation of K-Means and K-Means++ algorithms for the PHP plateform. It works with an unlimited number of dimentions.

Usage

Given the following points of R²

We want to find 3 clusters:

Now we can retrieve each cluster's centroid (the average meaning amongts its points) and all the points in it:

Example of output:

Heads up!

K-Means algorithm is non-deterministic so you may get different results when running it multiple times with the same data. The more points you add in the space, the more accurate the result will be.

You are strongly advised to read the Wikipedia article thoroughly before using this library.

K-Means++

When triggering the Kmeans\Space::solve method, you may provide an alternative seeding method in order to initialize the clusters with the David Arthur and Sergei Vassilvitskii algorithm which avoids poor clustering results.

Howto

Get coordinates of a point/cluster:

List all points of a space/cluster:

Attach data to a point:

Retrieve point data:

Watch the algorithm run

Each iteration step can be monitored using a callback function passed to Kmeans\Space::solve:

All versions of php-kmeans with dependencies

PHP Build Version
Package Version
Requires php Version >=5.4.0
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