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Unsupervised Feature Construction for Anomaly Detection in Time Series -- An Evaluation
Marine Hamon, Vincent Lemaire, Nour Eddine Yassine Nair-Benrekia · 2025-01-14 · via cs.LG updates on arXiv.org

To detect anomalies with precision and without prior knowledge in time series, is it better to build a detector from the initial temporal representation, or to compute a new (tabular) representation using an existing automatic variable construction library? In this article, we address this question by conducting an in-depth experimental study for two popular detectors (Isolation Forest and Local Outlier Factor). The obtained results, for 5 different datasets, show that the new representation, computed using the tsfresh library, allows Isolation Forest to significantly improve its performance.

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