TAILIEUCHUNG - Báo cáo khoa học: "Importance of Pronominal Anaphora resolution in Question Answering systems"

The main aim of this paper is to analyse the e ects of applying pronominal anaphora resolution to Question Answering QA systems. For this task a complete QA system has been implemented. System evaluation measures performance improvements obtained when information that is referenced anaphorically in documents is not ignored. | Importance of Pronominal Anaphora resolution in Question Answering systems José L. Vicedo and Antonio Ferrandez Departamento de Lenguajes y Sistemas Informaticos Universidad de Alicante Apartado 99. 03080 Alicante Spain vicedo antonio @ Abstract The main aim of this paper is to analyse the effects of applying pronominal anaphora resolution to Question Answering QA systems. For this task a complete QA system has been implemented. System evaluation measures performance improvements obtained when information that is referenced anaphorically in documents is not ignored. 1 Introduction Open domain QA systems are defined as tools capable of extracting the answer to user queries directly from unrestricted domain documents. Or at least systems that can extract text snippets from texts from whose content it is possible to infer the answer to a specific question. In both cases these systems try to reduce the amount of time users spend to locate a concrete information. This work is intended to achieve two principal objectives. First we analyse several document collections to determine the level of information referenced pronominally in them. This study gives US an overview about the amount of information that is discarded when these references are not solved. As second objective we try to measure improvements of solving this kind of references in QA systems. With this purpose in mind a full QA system has been implemented. Benefits obtained by solving pronominal references are measured by comparing system performance with and without taking into account information referenced pronominally. Evaluation shows that solving these references improves QA performance. In the following section the state-of-the-art of open domain QA systems will be summarised. Afterwards importance of pronominal references in documents is analysed. Next our approach and system components are described. Finally evaluation results are presented and discussed. 2 Background Interest in open domain

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