tailieunhanh - Báo cáo khoa học: "Segmented and unsegmented dialogue-act annotation with statistical dialogue models∗"

Dialogue systems are one of the most challenging applications of Natural Language Processing. In recent years, some statistical dialogue models have been proposed to cope with the dialogue problem. The evaluation of these models is usually performed by using them as annotation models. Many of the works on annotation use information such as the complete sequence of dialogue turns or the correct segmentation of the dialogue. This information is not usually available for dialogue systems. | Segmented and unsegmented dialogue-act annotation with statistical dialogue models Carlos D. Martinez Hinarejos Ramon Granell Jose Miguel Benedi Departamento de Sistemas Informaticos y Computation Universidad Politecnica de Valencia Camino de Vera s n 46022 Valencia cmartine rgranell jbenedi @ Abstract Dialogue systems are one of the most challenging applications of Natural Language Processing. In recent years some statistical dialogue models have been proposed to cope with the dialogue problem. The evaluation of these models is usually performed by using them as annotation models. Many of the works on annotation use information such as the complete sequence of dialogue turns or the correct segmentation of the dialogue. This information is not usually available for dialogue systems. In this work we propose a statistical model that uses only the information that is usually available and performs the segmentation and annotation at the same time. The results of this model reveal the great influence that the availability of a correct segmentation has in obtaining an accurate annotation of the dialogues. 1 Introduction In the Natural Language Processing NLP field one of the most challenging applications is dialogue systems Kuppevelt and Smith 2003 . A dialogue system is usually defined as a computer system that can interact with a human being through dialogue in order to complete a specific task . ticket reservation timetable consultation bank operations . Aust et al. 1995 Hardy et al. 2002 . Most dialogue system have a characteristic behaviour with respect to dialogue Work partially supported by the Spanish project TIC2003-08681-C02-02 and by Spanish Ministry of Culture under FPI grants. management which is known as dialogue strategy. It defines what the dialogue system must do at each point of the dialogue. Most of these strategies are rule-based . the dialogue strategy is defined by rules that are usually defined by a human expert Gorin et al. 1997 .