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Explaining anomalies through semi-supervised Autoencoders

delete2025-10-17
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OA
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Fabrizio Angiulli
F
Fabio Fassetti
L
Luca Ferragina
S
Simona Nisticò *
DOI:10.1016/j.array.2025.100537delete
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摘要

摘要

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本研究致力于解决设计可解释的异常检测器问题,这些检测器能为输入数据观测中的异常行为提供可理解的解释。具体而言,我们采用热力图作为解释,其中热力图可被视为一组特征得分。为解释异常,我们提出的方法(称为AE–XAD1,即基于自编码器的可解释异常检测)扩展了一种近期引入的自编码器架构的半监督变体。我们提案的主要思想是利用重建误差策略来检测偏离特征。与标准自编码器不同,它利用一种半监督损失,旨在最大化异常特征的重建与原始值之间的距离。通过此策略,我们的方法能在训练期间仅使用少量异常样本,学习隔离输入观测中的异常部分。实验结果表明,AE–XAD在解释不同场景中的异常时表现出高性能,同时保持最小的CO2排放量,展示了一种不仅高效且环保的设计。
Keyword:
Explainable Artificial Intelligence
Anomaly detection
Explainability by design
Green-aware AI
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