EGOS-DST:对话现象感知和模式引导的一步对话状态追踪算法

EGOS-DST:Efficient Schema-guided Approach to One-step Dialogue State Tracking for Diverse Expressions

为了平衡过度依赖本体和完全舍弃本体两种极端方式,近期的对话状态追踪工作专注于混合方式。目前,这些混合方式忽略了一些特殊现象,比如值共享和推荐接受。此外,被广泛使用的槽位门机制使模型很难并行处理槽位,并且还会将误差传播到槽值生成步骤。针对以上问题,提出一种新的混合方式,它能够处理多样性表达、未知值、值共享和推荐接受4种不同对话现象。通过修改候选值集合和模型输入,模型不再依赖槽位门机制并且能够一步并行处理槽位。实验结果显示,模型在英文数据集MultiWOZ 2.2和2.3上分别达到了57.7%和59.5%的联合目标准确率,在中文数据集RiSAWOZ上达到了68.1%,并且推理一次仅需10ms。最后还分析了模型的鲁棒性,在MultiWOZ 2.2上的结果显示即使推荐错误率达到15%,联合目标准确率仍有55.4%。

Recent dialogue state tracking works have focused on the hybrid approach to balance the two extreme methods(i.e.,over-reliance on ontology and complete abandoning ontology).However,some special phenomena are ignored in these works.For instant,value sharing and recommendation acceptance.In addition,the widely used slot gate mechanism makes it difficult for the model to process slots in parallel and the mechanism also propagates errors to the slot value generation steps.This paper proposes a new hybrid approach that deals with four different phenomena,namely diverse value,unseen value,value sharing and recommendation acceptance.By modifying the candidate value set and the model input,our model can parallelly process slots in one step and no longer depend on the slot gate.Experimental results indicate that the model achieves 57.7%and 59.5%joint goal accuracy on the English dataset MultiWOZ 2.2and 2.3,respectively,and reaches 68.1%on the Chinese dataset RiSAWOZ,with only 10ms infer time.Finally,the robustness of the model is analyzed.The results on MultiWOZ 2.2show that the joint target accuracy rate is 55.4%when the recommendation error rate reaches 15%.