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Domain-specific Named Entity Recognition with Document-Level Optimization

机译:具有文档级优化的特定于域的命名实体识别

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摘要

Previous studies normally formulate named entity recognition (NER) as a sequence labeling task and optimize the solution in the sentence level. In this article, we propose a document-level optimization approach to NER and apply it in a domain-specific document-level NER task. As a baseline, we apply a state-of-the-art approach, i.e., long-short-term memory (LSTM), to perform word classification. On this basis, we define a global objective function with the obtained word classification results and achieve global optimization via Integer Linear Programming (ILP). Specifically, in the ILP-based approach, we propose four kinds of constraints, i.e., label transition, entity length, label consistency, and domain-specific regulation constraints, to incorporate various entity recognition knowledge in the document level. Empirical studies demonstrate the effectiveness of the proposed approach to domain-specific document-level NER.
机译:先前的研究通常将命名实体识别(NER)制定为序列标记任务,并在句子级别优化解决方案。在本文中,我们提出了一种针对NER的文档级优化方法,并将其应用于特定于域的文档级NER任务。作为基准,我们应用了最先进的方法(即长短期记忆(LSTM))来进行单词分类。在此基础上,利用获得的词分类结果定义一个全局目标函数,并通过整数线性规划(ILP)实现全局优化。具体而言,在基于ILP的方法中,我们提出了四种约束,即标签转换,实体长度,标签一致性和特定于域的法规约束,以将各种实体识别知识纳入文档级别。实证研究表明,该方法对于特定领域文档级NER的有效性。

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