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Density-Based Spatial Clustering of Applications with Noise (DBSCAN) is a clustering algorithm able to find non-linearly separable and arbitrarily-shaped clusters given a radius and density constraint. In addition, DBSCAN can flag outliers (noise samples) and thus be used as a quasi-anomaly detector.


Noise samples are assigned the cluster number -1.

Interfaces: Estimator

Data Type Compatibility: Depends on distance kernel


# Name Default Type Description
1 radius 0.5 float The maximum distance between two points to be considered neighbors.
2 minDensity 5 int The minimum number of points within radius of each other to form a cluster.
3 tree BallTree Spatial The spatial tree used to run range searches.


use Rubix\ML\Clusterers\DBSCAN;
use Rubix\ML\Graph\Trees\BallTree;
use Rubix\ML\Kernels\Distance\Diagonal;

$estimator = new DBSCAN(4.0, 5, new BallTree(20, new Diagonal()));

Additional Methods#

This estimator does not have any additional methods.


  1. M. Ester et al. (1996). A Density-Based Algorithm for Discovering Clusters.