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Published in: Journal of Intelligent Manufacturing 6/2021

18-05-2020

Bound smoothing based time series anomaly detection using multiple similarity measures

Authors: Wenqing Wang, Junpeng Bao, Tao Li

Published in: Journal of Intelligent Manufacturing | Issue 6/2021

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Abstract

Time series data is pervasive in many applications and the anomaly detection about it is important, which will provide the early warning of some unexpected patterns. In this paper, we propose a multiple similarity based anomalous subsequences detection method, which is unsupervised and domain knowledge free. Firstly, to improve the time efficiency, an anomaly candidates selection scheme is introduced based on the locality sensitive hashing (LSH), which considers a subsequence that does not collide with the others as a potential anomaly. However, if the raw time series is noisy and the anomaly is subtle, the performance of LSH will be degraded. In order to address this problem, we present a smoothing method to remove the noise and highlight the anomalous part in a time series, which can help to decrease the collision probability between an anomaly and the other subsequences. Secondly, we employ Pareto analysis to incorporate multiple similarity measures since there are different types of anomalies in real applications. It is unlikely that a single similarity measure can perform consistently well on different types of anomalies. Thirdly a new anomaly score scheme is provided to evaluate each anomaly candidate, which is based on the number of non-dominated vectors. Finally, we conduct extensive experiments on benchmark datasets from diverse domains and compare our method with the state-of-the-art approaches. The results show that our method can reach higher accuracy.

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Appendix
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Literature
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go back to reference Nascimento, E. G. S., Tavares, O. D. L., & Souza, A. F. D. (2015). A cluster-based algorithm for anomaly detection in time series using Mahalanobis distance. In Proceedings of the international conference on artificial intelligence (pp. 622–628). Nascimento, E. G. S., Tavares, O. D. L., & Souza, A. F. D. (2015). A cluster-based algorithm for anomaly detection in time series using Mahalanobis distance. In Proceedings of the international conference on artificial intelligence (pp. 622–628).
Metadata
Title
Bound smoothing based time series anomaly detection using multiple similarity measures
Authors
Wenqing Wang
Junpeng Bao
Tao Li
Publication date
18-05-2020
Publisher
Springer US
Published in
Journal of Intelligent Manufacturing / Issue 6/2021
Print ISSN: 0956-5515
Electronic ISSN: 1572-8145
DOI
https://doi.org/10.1007/s10845-020-01583-0

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