Anomaly detection in non-stationary data: Ensemble based self-adaptive OCSVM

Abstract

With the emergence of data streaming applications that produce large data in motion, anomaly detection in non-stationary environments has become a major research focus. Unknown and unstable behaviour of data over time, limits the application of traditional anomaly detection methods that have been designed for stationary data. Moreover, basic assumptions of many existing works in the adaptive anomaly detection domain, such as the availability of labelled data over time or dealing with a known type of change in the data, are not valid for real-life applications. In this paper, we propose an unsupervised ensemble based anomaly detection method using One Class Support Vector Machines (OCSVMs). T..