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.

通过将词库整合到字符级序列中，我们提出了一种统一的格点图融合（ULGF）方法，用于中文命名实体识别。ULGF可以明确捕捉字符-词语空间中细粒度语义单元之间的各种语义和边界关系，通过将格点结构转换为统一的图形来实现。我们堆叠多个基于图形的源内自我关注和源间交叉门控融合层，以迭代地进行语义交互以学习节点表示。为了减轻对词语信息的过度依赖，我们进一步提出了以词库实体分类作为辅助任务。在四个中文命名实体识别基准数据集上的实验证明了我们ULGF方法的优越性。

统一晶格图融合用于中文命名实体识别