Task oriented dialog agents provide a natural language interface for users to complete their goal. Dialog State Tracking (DST), which is often a core component of these systems, tracks the system's understanding of the user's goal throughout the conversation. To enable accurate multi-domain DST, the model needs to encode dependencies between past utterances and slot semantics and understand the dialog context, including long-range cross-domain references. We introduce a novel architecture for this task to encode the conversation history and slot semantics more robustly by using attention mechanisms at multiple granularities. In particular, we use cross-attention to model relationships between the context and slots at different semantic levels and self-attention to resolve cross-domain coreferences. In addition, our proposed architecture does not rely on knowing the domain ontologies beforehand and can also be used in a zero-shot setting for new domains or unseen slot values. Our model improves the joint goal accuracy by 5% (absolute) in the full-data setting and by up to 2% (absolute) in the zero-shot setting over the present state-of-the-art on the MultiWoZ 2.1 dataset.

本文提出了一种新的架构，利用多粒度的注意力机制来更稳健地编码对话历史和槽的语义，用于实现准确的跨域对话状态跟踪，并在MultiWoZ 2.1数据集上将联合目标准确率提高了5%（绝对值），并在零-shot设置下比现有最先进技术提高至多2%（绝对值）。

MA-DST: 基于多注意力的可扩展对话状态跟踪