Explaining anomalies through semi-supervised Autoencoders
This work tackles the problem of designing explainable by design anomaly detectors, which provide intelligible explanations to abnormal behaviors in input data observations. In particular, we adopt heatmaps as explanations, where a heatmap can be regarded as a collection of per-feature scores. To ex...
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01.12.2025
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| Abstract | This work tackles the problem of designing explainable by design anomaly detectors, which provide intelligible explanations to abnormal behaviors in input data observations. In particular, we adopt heatmaps as explanations, where a heatmap can be regarded as a collection of per-feature scores. To explain anomalies, our approach, called AE–XAD11The code of AE–XAD is available at https://github.com/AIDALab-DIMES/AE-XAD. (for AutoEncoder-based eXplainable Anomaly Detection), extends a recently introduced semi-supervised variant of the Autoencoder architecture. The main idea of our proposal is to exploit a reconstruction error strategy for detecting deviating features. Unlike standard Autoencoders, it leverages a semi-supervised loss designed to maximize the distance between the reconstruction and the original value assumed by anomalous features. By means of this strategy, our approach learns to isolate anomalous portions of the input observations using only a few anomalous examples during training. Experimental results highlight that AE–XAD delivers high-level performance in explaining anomalies in different scenarios while maintaining a minimal CO2 footprint, showcasing a design that is not only highly effective but also environmentally conscious. |
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| AbstractList | This work tackles the problem of designing explainable by design anomaly detectors, which provide intelligible explanations to abnormal behaviors in input data observations. In particular, we adopt heatmaps as explanations, where a heatmap can be regarded as a collection of per-feature scores. To explain anomalies, our approach, called AE–XAD11The code of AE–XAD is available at https://github.com/AIDALab-DIMES/AE-XAD. (for AutoEncoder-based eXplainable Anomaly Detection), extends a recently introduced semi-supervised variant of the Autoencoder architecture. The main idea of our proposal is to exploit a reconstruction error strategy for detecting deviating features. Unlike standard Autoencoders, it leverages a semi-supervised loss designed to maximize the distance between the reconstruction and the original value assumed by anomalous features. By means of this strategy, our approach learns to isolate anomalous portions of the input observations using only a few anomalous examples during training. Experimental results highlight that AE–XAD delivers high-level performance in explaining anomalies in different scenarios while maintaining a minimal CO2 footprint, showcasing a design that is not only highly effective but also environmentally conscious. |
| ArticleNumber | 100537 |
| Author | Angiulli, Fabrizio Nisticò, Simona Fassetti, Fabio Ferragina, Luca |
| Author_xml | – sequence: 1 givenname: Fabrizio orcidid: 0000-0002-9860-7569 surname: Angiulli fullname: Angiulli, Fabrizio email: fabrizio.angiulli@unical.it – sequence: 2 givenname: Fabio orcidid: 0000-0002-8416-906X surname: Fassetti fullname: Fassetti, Fabio email: fabio.fassetti@unical.it – sequence: 3 givenname: Luca orcidid: 0000-0003-3184-4639 surname: Ferragina fullname: Ferragina, Luca email: luca.ferragina@unical.it – sequence: 4 givenname: Simona orcidid: 0000-0002-7386-2512 surname: Nisticò fullname: Nisticò, Simona email: simona.nistico@unical.it |
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| Keywords | Explainable Artificial Intelligence Green-aware AI Explainability by design Anomaly detection |
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