cs.CLJun 23, 2026

AutoSpecNER: A Fine-Grained Named Entity Recognition Dataset for Vehicle Specification Extraction

Authors: Jordan LeeFilippos VentirozosAbdirahman AbdullahmIoanna NtekaPeter ApplebyMatthew Shardlow

Organizations: Department of Computing and Mathematics, Manchester Metropolitan University, UK · *Work conducted during an internship at Autotrader UK. · Autotrader Research Group, Autotrader UK

Abstract

Vehicle advertisements contain rich specification information, but automotive NER resources remain limited. We introduce AutoSpecNER, an expert-annotated dataset for fine-grained entity recognition in vehicle listings. The dataset includes 659 advertisements from a popular car-selling website, with over 10,000 entities annotated across 15 categories, including MODEL, ENGINE_SPEC, and BATTERY_CAPACITY. Annotation quality was validated through inter-annotator agreement, achieving an average score of 91.5%. We benchmark rule-based extraction, fine-tuned transformer encoders, and large language models. DeBERTa achieves the best performance with a 90% micro-F1 score, outperforming the rule-based baseline (43%) and the strongest large language model (77.8%).

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