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SCL-RAI: Span-based Contrastive Learning with Retrieval Augmented Inference for Unlabeled Entity Problem in NER. (arXiv:2209.01646v2 [cs.CL] UPDATED)
Sept. 27, 2022, 1:14 a.m. | Shuzheng Si, Shuang Zeng, Jiaxing Lin, Baobao Chang
cs.CL updates on arXiv.org arxiv.org
Named Entity Recognition is the task to locate and classify the entities in
the text. However, Unlabeled Entity Problem in NER datasets seriously hinders
the improvement of NER performance. This paper proposes SCL-RAI to cope with
this problem. Firstly, we decrease the distance of span representations with
the same label while increasing it for different ones via span-based
contrastive learning, which relieves the ambiguity among entities and improves
the robustness of the model over unlabeled entities. Then we propose retrieval …
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