• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Improvement of accuracy of question-answering based on question reformulation

Research Project

Project/Area Number 17500062
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeSingle-year Grants
Section一般
Research Field Media informatics/Database
Research InstitutionNational University Corporation Yokohama National University

Principal Investigator

MORI Tatsunori  National university Corporation, Yokohama National University, Graduate School of Environment and Information Sciences, Professor, 大学院・環境情報研究院, 教授 (70212264)

Project Period (FY) 2005 – 2006
Project Status Completed (Fiscal Year 2006)
Budget Amount *help
¥3,500,000 (Direct Cost: ¥3,500,000)
Fiscal Year 2006: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2005: ¥2,100,000 (Direct Cost: ¥2,100,000)
KeywordsQuestion-answering / List-type question-answering / Ranking-type question-answering / Distribution of answer scores / EM algorithm / Contextual question-answering / Cross-lingual question-answering / 分脈依頼型質問応答
Research Abstract

This research originally aimed at the improvement of accuracy of list-type question answering. The list-type question-answering is the task in which a system requested to enumerate all correct answers to a given question. In our proposed method, we utilize the distribution of the score that an existing question answering system gives to answer candidates. First we assume that the distribution is a mixture of two distributions, i.e., one of the correct answers and one of the incorrect answers. Second we also suppose that each of the two distributions is a normal distribution. Under these assumptions, we proposed a method to separate the correct answers from the mixture of the distributions by using the EM algorithm. On the other hand, the boundary of the two distributions may be occasionally indistinct because there is a possibility that the question-answering system fails to produce appropriate scores. In such a case, we perform a re-calculation of scores according to the co-occurrence … More of each answer candidate and the keywords of the question sentence in the knowledge source.
The experimental results show that the utilization of the score distribution is effective for the list-type question-answering. However, the re-calculation of scores based on the co-occurrence does not work effectively.
Therefore, we also investigated a method based on the above findings, that is, the degree of distinctness of the two distributions' boundaries indicates the appropriateness of answer candidates that are found by the system for a given question. We generalized the notion of "question reformulation" as follows. We generate a set of question candidates by applying several possible interpretations to the original question. In this situation, the question reformulation can be achieved by selecting appropriate question candidates and their answer candidates.
For example, when we applied the question reformulation to contextual question-answering, the accuracy of question answering may be improved. The notion also can be used for the improvement of accuracy of cross-lingual question answering. Less

Report

(3 results)
  • 2006 Annual Research Report   Final Research Report Summary
  • 2005 Annual Research Report
  • Research Products

    (6 results)

All 2007 2006 2005

All Journal Article (6 results)

  • [Journal Article] A Method of Cross-language Question-Answering Based on Machine Translation and Noun Phrase Translation using Web documents2007

    • Author(s)
      Tatsunori Mori, Kousuke Takahashi
    • Journal Title

      Proceedings of NTCIR-6 workshop meeting (to appear)

    • Related Report
      2006 Annual Research Report
  • [Journal Article] Answering Contextual Questions Based on the Cohesion with Knowledge2006

    • Author(s)
      Tatsunori Mori, Shinpei Kawaguchi, Madoka Ishioroshi
    • Journal Title

      Computer Processing of Oriental Languages. Beyond the Orient : The Research Challenges Ahead, Lecture Notes in Computer Science LNCS4285

      Pages: 1-12

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Annual Research Report 2006 Final Research Report Summary
  • [Journal Article] Answering Contextual Questions Based on the Cohesion with Knowledge2006

    • Author(s)
      Tatsunori Mori, Shinpei Kawaguchi, Madoka Ishioroshi
    • Journal Title

      Computer Processing of Oriental Languages. Beyond the Orient : The Research Challenges Ahead, Lecture Notes in Computer Science LNCS 4285

      Pages: 1-12

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Japanese Question-answering System Using A^* Search and Its Improvement2005

    • Author(s)
      Tatsunori Mori
    • Journal Title

      ACM Transactions on Asian Language Information Processing 4・3

      Pages: 280-304

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Japanese Question-answering System Using A^* Search and Its Improvement2005

    • Author(s)
      Tatsunori Mori
    • Journal Title

      ACM Transactions on Asian Language Information Processing 4-3

      Pages: 280-304

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2006 Final Research Report Summary
  • [Journal Article] Japanese Question-answering System Using A* Search and Its Improvement2005

    • Author(s)
      Tatsunori Mori
    • Journal Title

      ACM Transactions on Asian Language Information Processing 4・3

      Pages: 280-304

    • Related Report
      2005 Annual Research Report

URL: 

Published: 2005-04-01   Modified: 2016-04-21  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi