A Unifying Review of Deep and Shallow Anomaly Detection

• URL: http://arxiv.org/abs/2009.11732v3
• Date: Mon, 8 Feb 2021 12:43:59 GMT
• Title: A Unifying Review of Deep and Shallow Anomaly Detection
• Authors: Lukas Ruff, Jacob R. Kauffmann, Robert A. Vandermeulen, Gr\'egoire Montavon, Wojciech Samek, Marius Kloft, Thomas G. Dietterich, Klaus-Robert M\"uller
• Abstract summary: We aim to identify the common underlying principles as well as the assumptions that are often made implicitly by various methods. We provide an empirical assessment of major existing methods that is enriched by the use of recent explainability techniques. We outline critical open challenges and identify specific paths for future research in anomaly detection.
• Score: 38.202998314502786
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Deep learning approaches to anomaly detection have recently improved the state of the art in detection performance on complex datasets such as large collections of images or text. These results have sparked a renewed interest in the anomaly detection problem and led to the introduction of a great variety of new methods. With the emergence of numerous such methods, including approaches based on generative models, one-class classification, and reconstruction, there is a growing need to bring methods of this field into a systematic and unified perspective. In this review we aim to identify the common underlying principles as well as the assumptions that are often made implicitly by various methods. In particular, we draw connections between classic 'shallow' and novel deep approaches and show how this relation might cross-fertilize or extend both directions. We further provide an empirical assessment of major existing methods that is enriched by the use of recent explainability techniques, and present specific worked-through examples together with practical advice. Finally, we outline critical open challenges and identify specific paths for future research in anomaly detection.

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