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arXiv 1812.01889cs.CLcs.IR
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基于知识图谱的开放域问题实体发现与链接解决方案

A Knowledge Graph Based Solution for Entity Discovery and Linking in Open-Domain Questions

Peking University(北京大学);Harbin Institute of Technology(哈尔滨工业大学)

Kai Lei, Bing Zhang, Yong Liu, Yang Deng, Dongyu Zhang, Ying Shen

摘要:

命名实体发现和链接是问答系统的基础和核心部分。在问句实体发现与链接(Question Entity Discovery and Linking,QEDL)问题中,由于短问句中的多个实体很难被完全发现,而短文本中的不完整信息又使得实体链接难以实现,从而对传统的方法提出了挑战。为了克服这些困难,我们提出了一个基于知识图谱的QEDL解决方案,并开发了一个系统,包括问题实体发现(QED)模块和实体链接(EL)模块。QED模块的方法是两种方法的折衷和集成。一种是基于知识图谱检索的方法,该方法能够提取更多的问题实体,保证召回率;另一种是基于条件随机场(CRF)的方法,该方法提高了查准率。将EL模块视为一个排序问题,利用学习排序(LTR)方法,结合语义相似度、文本相似度和实体流行度等特征,提取并充分利用短文本中的信息。在一个共享的QEDL评估任务的官方数据集上,我们的方法可以获得64.44%的QED和64.86%的EL的F1分数,排名第二,这表明它对QEDL问题的实际使用。

英文摘要:

Named entity discovery and linking is the fundamental and core component of question answering. In Question Entity Discovery and Linking (QEDL) problem, traditional methods are challenged because multiple entities in one short question are difficult to be discovered entirely and the incomplete information in short text makes entity linking hard to implement. To overcome these difficulties, we proposed a knowledge graph based solution for QEDL and developed a system consists of Question Entity Discovery (QED) module and Entity Linking (EL) module. The method of QED module is a tradeoff and ensemble of two methods. One is the method based on knowledge graph retrieval, which could extract more entities in questions and guarantee the recall rate, the other is the method based on Conditional Random Field (CRF), which improves the precision rate. The EL module is treated as a ranking problem and Learning to Rank (LTR) method with features such as semantic similarity, text similarity and entity popularity is utilized to extract and make full use of the information in short texts. On the official dataset of a shared QEDL evaluation task, our approach could obtain 64.44% F1 score of QED and 64.86% accuracy of EL, which ranks the 2nd place and indicates its practical use for QEDL problem.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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