Generative encoder-decoder models offer great promise in developing
domain-general dialog systems. However, they have mainly been applied to
open-domain conversations. This paper presents a practical and novel framework
for building task-oriented dialog systems based on encoder-decoder models. This
framework enables encoder-decoder models to accomplish slot-value independent
decision-making and interact with external databases. Moreover, this paper
shows the flexibility of the proposed method by interleaving chatting
capability with a slot-filling system for better out-of-domain recovery. The
models were trained on both real-user data from a bus information system and
human-human chat data. Results show that the proposed framework achieves good
performance in both offline evaluation metrics and in task success rate with
human users.

本论文提出了一个基于编码器 - 解码器模型的任务导向对话系统的实用且新颖的框架，使其能够完成与外部数据库的交互和独立决策，并将聊天功能与插槽填充系统交替使用，以提高领域外恢复的能力。在实验中，使用公交信息系统的真实用户数据和人际对话数据，所提出的框架表现优异，且离线评估指标和任务成功率与人类用户相当。