Multi-parameter streaming outlier detection

Distance-based outlier detection techniques is a wide-spread methodology for anomaly detection. Despite their effectiveness, a main limitation is that they heavily rely on the dataset and the parameters chosen in order to establish the right status of each data point. These parameters typically include, but are not limited to, the neighborhood radius and threshold. In continuous streaming environments, the need for real-time analysis does not permit for an algorithm to be restarted multiple times with different parameters until the right combination is specified. This gives rise to the need for one technique that combines an arbitrary number of parameterizations with the use of minimal yet sufficient computer resources. In this work we both compare the state-of-the-art techniques for handling multiple queries in distance-based outlier detection algorithms and we propose a novel technique for multi-parameter distance-based outlier detection tailored to distributed continuous streaming environments, such as Spark and Flink.