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Detection of Anomalies and Novelties in Time Series with Self-Organizing Networks
Aguayo, Leonardo ; Barreto, Guilherme A.
This paper introduces the DANTE project: Detection of Anomalies and Novelties in Time sEries with self-organizing networks. The goal of this project is to evaluate several self-organizing networks in the detection of anomalies/novelties in dynamic data patterns. For this purpose, we first describe three standard clustering-based approaches which uses well-known self-organizing neural architectures, such as the SOM and the Fuzzy ART algorithms, and then present a novel approach based on the Operator Map (OPM) network. The OPM is a generalization of the SOM where neurons are regarded as temporal filters for dynamic patters. The OPM is used to build local adaptive filters for a given nonstationary time series. Non-parametric confidence intervals are then computed for the residuals of the local models and used as decision thresholds for detecting novelties/anomalies. Computer simulations are carried out to compare the performances of the aforementioned algorithms.
||time series analysis, novelty detection, operator map, adaptive filtering, self-organizing networks
||Technische Fakultät, Arbeitsgruppen der Informatik
Aguayo, Leonardo ; Barreto, Guilherme A. (2007) Detection of Anomalies and Novelties in Time Series with Self-Organizing Networks.