Título:
GNNs for time series anomaly detection : An open-source framework and a critical evaluation
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Autor:
Bello, Federico
Chiarlone, Gonzalo
Fiori, Marcelo
García González, Gastón
Larroca, Federico
Chiarlone, Gonzalo
Fiori, Marcelo
García González, Gastón
Larroca, Federico
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Tipo de documento:
Ponencia
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Palabras clave:
Multivariate Time Series
Graph Neural Networks
Evaluation Metrics
Score-based Anomaly Detection
Methodological Assessment
Graph Neural Networks
Evaluation Metrics
Score-based Anomaly Detection
Methodological Assessment
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Año de publicación:
2026
Contenido:
Resumen:
There is growing interest in applying graph-based methods to Time Series Anomaly Detection (TSAD), particularly Graph Neural Networks (GNNs), as they naturally model dependencies among multivariate signals. GNNs are typically used as backbones in score-based TSAD pipelines, where anomalies are identified through reconstruction or prediction errors followed by thresholding. However, and despite promising results, the field still lacks standardized frameworks for evaluation and suffers from persistent issues with metric design and interpretation. We thus present an open-source framework for TSAD using GNNs, designed to support reproducible experimentation across datasets, graph structures, and evaluation strategies. Built with flexibility and extensibility in mind, the framework facilitates systematic comparisons between TSAD models and enables in-depth analysis of performance and interpretability. Using this tool, we evaluate several GNN-based architectures alongside baseline models across two real-world datasets with contrasting structural characteristics. Our results show that GNNs not only improve detection performance but also offer significant gains in interpretability, an especially valuable feature for practical diagnosis. We also find that attention-based GNNs offer robustness when graph structure is uncertain or inferred. In addition, we reflect on common evaluation practices in TSAD, showing how certain metrics and thresholding strategies can obscure meaningful comparisons. Overall, this work contributes both practical tools and critical insights to advance the development and evaluation of graph-based TSAD systems.
Descripción:
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Editorial:
ICPRAM
EN:
ICPRAM 2026 : 15th International Conference on Pattern Recognition Applications and Methods, Marbella, Spain, 02-04 mar. 2026, pp. 1-9.
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Citación:
Bello, F., Chiarlone, G., Fiori, M. y otros. GNNs for time series anomaly detection : An open-source framework and a critical evaluation [en línea]. EN: ICPRAM 2026 : 15th International Conference on Pattern Recognition Applications and Methods, Marbella, Spain, 02-04 mar. 2026, pp. 1-9.
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Departamento académico:
Telecomunicaciones
Grupo de investigación:
Análisis de Redes, Tráficos y Estadísticas de Servicios (ARTES)
Licencia:
Licencia Creative Commons Atribución - No Comercial - Sin Derivadas (CC - By-NC-ND 4.0)
Colecciones:
| Ficheros | Descripción | Tamaño | Formato | ||
|---|---|---|---|---|---|
| BCFGL26.pdf | Camera-Ready | 600.71 KB | Adobe PDF |