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Complex event forecasting with prediction suffix trees

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Abstract

Complex event recognition (CER) systems have become popular in the past two decades due to their ability to “instantly” detect patterns on real-time streams of events. However, there is a lack of methods for forecasting when a pattern might occur before such an occurrence is actually detected by a CER engine. We present a formal framework that attempts to address the issue of complex event forecasting (CEF). Our framework combines two formalisms: (a) symbolic automata which are used to encode complex event patterns and (b) prediction suffix trees which can provide a succinct probabilistic description of an automaton’s behavior. We compare our proposed approach against state-of-the-art methods and show its advantage in terms of accuracy and efficiency. In particular, prediction suffix trees, being variable-order Markov models, have the ability to capture long-term dependencies in a stream by remembering only those past sequences that are informative enough. We also discuss how CEF solutions should be best evaluated on the quality of their forecasts.

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Notes

  1. The report may be found here: https://arxiv.org/abs/2109.00287.

  2. https://feedzai.com.

  3. http://speedd-project.eu.

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Acknowledgements

This work has received funding from the EU Horizon 2020 research and innovation program INFORE under Grant Agreement No. 825070.

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Correspondence to Elias Alevizos.

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Alevizos, E., Artikis, A. & Paliouras, G. Complex event forecasting with prediction suffix trees. The VLDB Journal 31, 157–180 (2022). https://doi.org/10.1007/s00778-021-00698-x

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