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Currently, most unsupervised approaches detect anomalies by identifying the deviant patterns from normal samples, and some semi-supervised studies also use labeled anomalies to improve performance. However, few studies have focused on how to take advantage of potential anomalies in an easily obtained and large-scale unlabeled dataset. Meanwhile, in a semi-supervised setting, although we assume there will be a small number of labeled anomalies, the task of anomaly classification is under-exploited, which is important for domain experts. In this work, we focus on the problem of anomaly detection and classification with limited labeled samples and a large number of unlabeled samples. To this end, we develop a few-shot anomaly detection and classification model based on reinforced data selection with a combinatorial reward, called FADScr. FADScr iteratively improves performance by exploring the unlabeled dataset and selects informative samples to augment the training set to enhance both anomaly detection and classification. Experimental results show that our proposed framework is able to improve the performance of anomaly detection and classification with only a few labeled samples initially.<\/jats:p>","DOI":"10.1007\/s10115-025-02572-6","type":"journal-article","created":{"date-parts":[[2025,8,30]],"date-time":"2025-08-30T03:44:34Z","timestamp":1756525474000},"page":"11675-11700","update-policy":"https:\/\/doi.org\/10.1007\/springer_crossmark_policy","source":"Crossref","is-referenced-by-count":1,"title":["Few-shot anomaly detection and classification through reinforced data selection with a combinatorial reward"],"prefix":"10.1007","volume":"67","author":[{"given":"Xiao","family":"Han","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Depeng","family":"Xu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Shuhan","family":"Yuan","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xintao","family":"Wu","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"297","published-online":{"date-parts":[[2025,8,30]]},"reference":[{"key":"2572_CR1","doi-asserted-by":"crossref","unstructured":"Akcay S, Atapour-Abarghouei A, Breckon TP (2018) GANomaly: Semi-supervised anomaly detection via adversarial training. 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