Local Outlier Factor#
Local Outlier Factor (LOF) measures the local deviation of density of an unknown sample with respect to its k nearest neighbors from the training set. As such, LOF only considers the local region (or neighborhood) of an unknown sample which enables it to detect anomalies within individual clusters of data.
Data Type Compatibility: Depends on distance kernel
|1||k||20||int||The k nearest neighbors that form a local region.|
|2||contamination||null||float||The proportion of outliers that are assumed to be present in the training set.|
|3||tree||KDTree||Spatial||The spatial tree used to run nearest neighbor searches.|
Return the base spatial tree instance:
public tree() : Spatial
use Rubix\ML\AnomalyDetectors\LocalOutlierFactor; use Rubix\ML\Graph\Trees\BallTree; use Rubix\ML\Kernels\Distance\Euclidean; $estimator = new LocalOutlierFactor(20, 0.1, new BallTree(30, new Euclidean));
- M. M. Breunig et al. (2000). LOF: Identifying Density-Based Local Outliers.