file - ChaSen - 奈良先端科学技術大学院大学

Chapter 3Question Type Identification forMulti-Sentence Queries3.1 IntroductionQuestion type identification is a question analysis executed by question answeringsystems, information retrieval, dialogue system, and other applications. Questionanalysis provides a variety of information from query inputs into the applicationsystem, and converts the queries into their formats required for the internal processingof the application. Question type identification is a process to extractquestions from a query given in a natural language sentence and identifying itsintention with other operations in question analysis. This processing is the initialstage of the internal processing flow of the application, thus its accuracy exertsa major effect on the accuracy of the entire application. This Chapter describesquestion type identification in question-answering, but it is applicable to otherapplications requiring question type identification such as information retrieval.Diverse question types handled by question type identification are proposedin conjunction with the queries permitted as input by applications. In the fieldof information retrieval, the Text Retrieval Conference (TREC), an internationalevaluation campaign, and the NII Test Collection for IR Systems (NTCIR) 1 havebeen researching question-answering for large-volume documents in any field. It1 http://research.nii.ac.jp/ntcir/index–en.html17