Model Selection of Anomaly Detectors in the Absence of Labeled Validation Data
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Abstract (arXiv)
Anomaly detection is the task of identifying abnormal samples in large unlabeled datasets. While the advent of foundation models has produced powerful zero-shot anomaly detection methods, their deployment in practice is often hindered by the absence of labeled validation data -- without it, their detection performance cannot be evaluated reliably. In this work, we propose SWSA (Selection With Synthetic Anomalies): a general-purpose framework to select image-based anomaly detectors without labeled validation data. Instead of collecting labeled validation data, we generate synthetic anomalies without any training or fine-tuning, using only a small support set of normal images. Our synthetic anomalies are used to create detection tasks that compose a validation framework for model selection. In an empirical study, we evaluate SWSA with three types of synthetic anomalies and on two selection tasks: model selection of image-based anomaly detectors and prompt selection for CLIP-based anomaly detection. SWSA often selects models and prompts that match selections made with a ground-truth validation set, outperforming baseline selection strategies.
Key facts. Cited by 8 papers in the map (data through 7 Oct 2026). Builds on 51 of its 90 references that are in the map. First posted on arXiv 16 Oct 2023.
Builds on
51 of 90 references.
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38 more
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Citing papers per year: 2024: 1; 2025: 2; 2026: 5.
8 papers.
- 2024Uncertainty-aware Evaluation of Auxiliary Anomalies with the Expected Anomaly Posteriorcited by 2
- 2025Contextual Learning for Anomaly Detection in Tabular Datacited by 1
- 2025ASBench: Image Anomalies Synthesis Benchmark for Anomaly Detectioncited by 1
- 2026Can We Predict Anomaly Detection Performance from Embedding-Space Geometry?cited by 1
- 2026AUCp: Pseudo-AUC for Inference Model Selection with Unlabeled Validation Data in Abnormality Detectioncited by 0
- 2026Reliability-Aware Prototype Calibration for Frozen Pose-Flow Video Anomaly Detectioncited by 0
- 2026Anomaly-Free Self-Optimization via AUC Boundscited by 0
- 2026Visual Anomaly Synthesis for Model Selection in Data Scarcitycited by 0
- 2026Visual Anomaly Synthesis for Model Selection in Data Scarcity29 Sep 2026
- 2026Anomaly-Free Self-Optimization via AUC Bounds23 Sep 2026
- 2026Can We Predict Anomaly Detection Performance from Embedding-Space Geometry?22 Sep 2026
- 2026Reliability-Aware Prototype Calibration for Frozen Pose-Flow Video Anomaly Detection18 Jun 2026
- 2026AUCp: Pseudo-AUC for Inference Model Selection with Unlabeled Validation Data in Abnormality Detection7 Jun 2026
- 2025ASBench: Image Anomalies Synthesis Benchmark for Anomaly Detection9 Oct 2025
- 2025Contextual Learning for Anomaly Detection in Tabular Data10 Sep 2025
- 2024Uncertainty-aware Evaluation of Auxiliary Anomalies with the Expected Anomaly Posterior22 May 2024