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PromptNER: A Prompting Method for Few-shot Named Entity Recognition via k Nearest Neighbor Search

20 May 2023arXiv:2305.12217archive 2025-07-28

Mozhi Zhang, Hang Yan, Yaqian Zhou, Xipeng Qiu

Few-shot Named Entity Recognition (NER) is a task aiming to identify named entities via limited annotated samples. Recently, prototypical networks have shown promising performance in few-shot NER. Most of prototypical networks will utilize the entities from the support set to construct label prototypes and use the query set to compute span-level similarities and optimize these label prototype representations. However, these methods are usually unsuitable for fine-tuning in the target domain, where only the support set is available. In this paper, we propose PromptNER: a novel prompting method for few-shot NER via k nearest neighbor search. We use prompts that contains entity category information to construct label prototypes, which enables our model to fine-tune with only the support set. Our approach achieves excellent transfer learning ability, and extensive experiments on the Few-NERD and CrossNER datasets demonstrate that our model achieves superior performance over state-of-the-art methods.

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Few-shot NERNERNamed Entity RecognitionNamed Entity Recognition (NER)Transfer Learningfew-shot-nernamed-entity-recognition

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