tailieunhanh - Báo cáo khoa học: "Searching Questions by Identifying Question Topic and Question Focus"

This paper is concerned with the problem of question search. In question search, given a question as query, we are to return questions semantically equivalent or close to the queried question. In this paper, we propose to conduct question search by identifying question topic and question focus. More specifically, we first summarize questions in a data structure consisting of question topic and question focus. Then we model question topic and question focus in a language modeling framework for search. We also propose to use the MDLbased tree cut model for identifying question topic and question focus automatically. . | Searching Questions by Identifying Question Topic and Question Focus Huizhong Duan1 Yunbo Cao1 2 Chin-Yew Lin2 and Yong Yu1 1 Shanghai Jiao Tong University Shanghai China 200240 summer yyu @ 2Microsoft Research Asia Beijing China 100080 cyl @ Abstract This paper is concerned with the problem of question search. In question search given a question as query we are to return questions semantically equivalent or close to the queried question. In this paper we propose to conduct question search by identifying question topic and question focus. More specifically we first summarize questions in a data structure consisting of question topic and question focus. Then we model question topic and question focus in a language modeling framework for search. We also propose to use the MDL-based tree cut model for identifying question topic and question focus automatically. Experimental results indicate that our approach of identifying question topic and question focus for search significantly outperforms the baseline methods such as Vector Space Model VSM and Language Model for Information Retrieval LMIR . 1 Introduction Over the past few years online services have been building up very large archives of questions and their answers for example traditional FAQ services and emerging community-based Q A services . Yahoo Answers1 Live QnA2 and Baidu Zhidao3 . To make use of the large archives of questions and their answers it is critical to have functionality facilitating users to search previous answers. Typically such functionality is achieved by first retrieving questions expected to have the same answers as a queried question and then returning the related answers to users. For example given question Q1 in Table 1 question Q2 can be re 1 http 2 http 3 http turned and its answer will then be used to answer Q1 because the answer of Q2 is expected to partially satisfy the queried question Q1. .

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