Unified Lattice Graph Fusion for Chinese Named Entity Recognition

• URL: http://arxiv.org/abs/2312.16917v1
• Date: Thu, 28 Dec 2023 09:31:25 GMT
• Title: Unified Lattice Graph Fusion for Chinese Named Entity Recognition
• Authors: Dixiang Zhang, Junyu Lu, Pingjian Zhang
• Abstract summary: We propose a Unified Lattice Graph Fusion (ULGF) approach for Chinese named entity recognition. We stack multiple graph-based intra-source self-attention and inter-source cross-gating fusion layers that iteratively carry out semantic interactions to learn node representations.
• Score: 9.863877505377165
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Integrating lexicon into character-level sequence has been proven effective to leverage word boundary and semantic information in Chinese named entity recognition (NER). However, prior approaches usually utilize feature weighting and position coupling to integrate word information, but ignore the semantic and contextual correspondence between the fine-grained semantic units in the character-word space. To solve this issue, we propose a Unified Lattice Graph Fusion (ULGF) approach for Chinese NER. ULGF can explicitly capture various semantic and boundary relations across different semantic units with the adjacency matrix by converting the lattice structure into a unified graph. We stack multiple graph-based intra-source self-attention and inter-source cross-gating fusion layers that iteratively carry out semantic interactions to learn node representations. To alleviate the over-reliance on word information, we further propose to leverage lexicon entity classification as an auxiliary task. Experiments on four Chinese NER benchmark datasets demonstrate the superiority of our ULGF approach.

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