【摘要】 答案选择是问答系统的一个关键步骤,它的任务是从候选答案集中选择出最佳答案返给用户,其主要研究内容包括答案选择的标准、方法及评价。该文首先介绍了主要的答案选择标准,分析了答案选择标准与问答系统评测之间的关系。然后将答案选择策略分为基于冗余的策略、基于相似性的策略和基于推理的策略,分别对每种策略的主要答案选择方法和特点进行了概述。随后又介绍了答案选择的评价指标及答案验证评测。最后讨论了答案选择所面临的主要问题,并对其未来的发展方向进行了展望。更多还原

【Abstract】 Answer selection as a crucial step in question answering system is to choose the best answer from the candidates.The research issues include the criteria,the strategies,the methods and the evaluation for answer selection.This paper first illustrates the main answer selection criteria and analyzes the relationship between the criteria and the question answering evaluation.Then it summarizes the answer selection strategies into redundancy-based,similarity-based and reasoning-based strategy,presenting the algorithms and characteristics of each strategy.The evaluation measures for answer selection and the Answer Validation Exercise are also introduced.Finally,the paper discusses the major problems in answer selection and the prospects for its future research.更多还原