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Scalable and Accurate Dialogue State Tracking via Hierarchical Sequence Generation
- Publication Year :
- 2019
-
Abstract
- Existing approaches to dialogue state tracking rely on pre-defined ontologies consisting of a set of all possible slot types and values. Though such approaches exhibit promising performance on single-domain benchmarks, they suffer from computational complexity that increases proportionally to the number of pre-defined slots that need tracking. This issue becomes more severe when it comes to multi-domain dialogues which include larger numbers of slots. In this paper, we investigate how to approach DST using a generation framework without the pre-defined ontology list. Given each turn of user utterance and system response, we directly generate a sequence of belief states by applying a hierarchical encoder-decoder structure. In this way, the computational complexity of our model will be a constant regardless of the number of pre-defined slots. Experiments on both the multi-domain and the single domain dialogue state tracking dataset show that our model not only scales easily with the increasing number of pre-defined domains and slots but also reaches the state-of-the-art performance.<br />Comment: The 2019 Conference on Empirical Methods in Natural Language Processing (EMNLP 2019); Updated empirical results
Details
- Database :
- arXiv
- Publication Type :
- Report
- Accession number :
- edsarx.1909.00754
- Document Type :
- Working Paper