In a task-oriented dialogue system, Dialogue State Tracking (DST) keeps track of all important information by filling slots with values given through the conversation. Existing methods generally rely on a predefined set of values and struggle to generalise to previously unseen slots in new domains. In this paper, we propose a multi-domain and multi-lingual dialogue state tracker in a neural reading comprehension approach. Our approach fills the slot values using span prediction, where the values are extracted from the dialogue itself. With a novel training strategy and an independent domain classifier, empirical results demonstrate that our model is a domain-scalable and open-vocabulary model that achieves 53.2% Joint Goal Accuracy (JGA) on MultiWOZ 2.1. We show its competitive transferability by zero-shot domain-adaptation experiments on MultiWOZ 2.1 with an average JGA of 31.6% for five domains. In addition, it achieves cross-lingual transfer with state-of-the-art zero-shot results, 64.9% JGA from English to German and 68.6% JGA from English to Italian on WOZ 2.0.

本文提出了一种领域无关的抽取式问答方法用于对话状态跟踪，通过训练一个分类器来预测多个领域的出现情况，将复杂的领域信息进行分离并在活动领域提取跨域问题答案，在多个数据集上达成了优秀的零-shot转移模型表现。

XQA-DST：多域和多语言对话状态跟踪