XL-NBT: A Cross-lingual Neural Belief Tracking Framework

Wenhu Chen, Jianshu Chen, Yu Su, Xin Wang, Dong Yu, Xifeng Yan, William Yang Wang


Abstract
Task-oriented dialog systems are becoming pervasive, and many companies heavily rely on them to complement human agents for customer service in call centers. With globalization, the need for providing cross-lingual customer support becomes more urgent than ever. However, cross-lingual support poses great challenges—it requires a large amount of additional annotated data from native speakers. In order to bypass the expensive human annotation and achieve the first step towards the ultimate goal of building a universal dialog system, we set out to build a cross-lingual state tracking framework. Specifically, we assume that there exists a source language with dialog belief tracking annotations while the target languages have no annotated dialog data of any form. Then, we pre-train a state tracker for the source language as a teacher, which is able to exploit easy-to-access parallel data. We then distill and transfer its own knowledge to the student state tracker in target languages. We specifically discuss two types of common parallel resources: bilingual corpus and bilingual dictionary, and design different transfer learning strategies accordingly. Experimentally, we successfully use English state tracker as the teacher to transfer its knowledge to both Italian and German trackers and achieve promising results.
Anthology ID:
D18-1038
Volume:
Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing
Month:
October-November
Year:
2018
Address:
Brussels, Belgium
Editors:
Ellen Riloff, David Chiang, Julia Hockenmaier, Jun’ichi Tsujii
Venue:
EMNLP
SIG:
SIGDAT
Publisher:
Association for Computational Linguistics
Note:
Pages:
414–424
Language:
URL:
https://aclanthology.org/D18-1038
DOI:
10.18653/v1/D18-1038
Bibkey:
Cite (ACL):
Wenhu Chen, Jianshu Chen, Yu Su, Xin Wang, Dong Yu, Xifeng Yan, and William Yang Wang. 2018. XL-NBT: A Cross-lingual Neural Belief Tracking Framework. In Proceedings of the 2018 Conference on Empirical Methods in Natural Language Processing, pages 414–424, Brussels, Belgium. Association for Computational Linguistics.
Cite (Informal):
XL-NBT: A Cross-lingual Neural Belief Tracking Framework (Chen et al., EMNLP 2018)
Copy Citation:
PDF:
https://aclanthology.org/D18-1038.pdf
Attachment:
 D18-1038.Attachment.pdf
Code
 wenhuchen/Cross-Lingual-NBT