목적지향 대화 시스템을 위한 챗봇 연구
A Chatter Bot for a Task-Oriented Dialogue System
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초록
목적 지향 대화 시스템에서 자유대화를 지원하기 위해 챗봇이 활용되고 있다. 그러나 목적지향 대화시스템을 위한 챗봇과 독립 챗봇에 대한 사용자 기대와 평가가 같은지에 대한 연구는 거의 없는 상황이다. 본 논문에서는 목적지향 대화시스템으로 구현한 영어 교육용 대화시스템에서, 대화의 자유도를 높이기 위하여 주제외 사용자 발화를 허용하고, 이에 대응하기 위한 챗봇을 개발하였다. 독립 챗봇과 보조 시스템으로서의 챗봇에 대하여 비교 평가함으로, 서로 다른 시스템에 대한 사용자의 서로 다른 기대를 살펴보았다. 또한 검색 기반 챗봇과 신경망 기술을 이용한 생성 기반 챗봇에 대한 비교 평가를 통해 이들의 장단점과 향후 활용 방안에 대하여 살펴보았다.
Abstract
Chatter bots are normally used in task-oriented dialogue systems to support free conversations. However, there is not much research on how chatter bots as auxiliary system should be different from independent ones. In this paper, we have developed a chatter bot for a dialogue-based computer assisted language learning (DB-CALL) system. We compared the chatter bot in two different cases: as an independent bot, and as an auxiliary system. The results showed that, the chatter bot as an auxiliary system showed much lower satisfaction than the independent one. A discussion is held about the difference between an auxiliary chatter bot and an independent bot. In addition, we evaluated a search-based chatter bot and a deep learning based chatter bot. The advantages and disadvantages of both methods are discussed.
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