An Empirical Study on Anomaly Detection Algorithms for Extremely Imbalanced Datasets - Artificial Intelligence Applications and Innovations
Conference Papers Year : 2022

An Empirical Study on Anomaly Detection Algorithms for Extremely Imbalanced Datasets

Gonçalo Fontes
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Arthur Matta
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André Pilastri
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Abstract

Anomaly detection attempts to identify abnormal events that deviate from normality. Since such events are often rare, data related to this domain is usually imbalanced. In this paper, we compare diverse preprocessing and Machine Learning (ML) state-of-the-art algorithms that can be adopted within this anomaly detection context. These include two unsupervised learning algorithms, namely Isolation Forests (IF) and deep dense AutoEncoders (AE), and two supervised learning approaches, namely Random Forest and an Automated ML (AutoML) method. Several empirical experiments were conducted by adopting seven extremely imbalanced public domain datasets. Overall, the IF and AE unsupervised methods obtained competitive anomaly detection results, which also have the advantage of not requiring labeled data.
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hal-04317169 , version 1 (01-12-2023)

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Gonçalo Fontes, Luís Miguel Matos, Arthur Matta, André Pilastri, Paulo Cortez. An Empirical Study on Anomaly Detection Algorithms for Extremely Imbalanced Datasets. 18th IFIP International Conference on Artificial Intelligence Applications and Innovations (AIAI), Jun 2022, Hersonissos, Greece. pp.85-95, ⟨10.1007/978-3-031-08333-4_7⟩. ⟨hal-04317169⟩
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