INTERSPEECH 2009
10th Annual Conference of the International Speech Communication Association

Brighton, United Kingdom
September 6-10, 2009

Recent Advances in WFST-Based Dialog System

Chiori Hori, Kiyonori Ohtake, Teruhisa Misu, Hideki Kashioka, Satoshi Nakamura

NICT, Japan

To construct an expandable and adaptable dialog system which handles multiple tasks, we proposed a dialog system using a weighted finite-state transducer (WFST) in which users concept and system action tags are input and output of the transducer, respectively. To test the potential of the WFST-based dialog management (DM) platform using statistical DM models, we constructed a dialog system using a human-to-human spoken dialog corpus for hotel reservation, which is annotated with Interchange Format (IF). A scenario WFST and a spoken language understanding (SLU) WFST were obtained from the corpus and then composed together and optimized. We evaluated the detection accuracy of the system next actions. In this paper, we focus on how WFST optimization operations contribute to the performance of the system. In addition, we have constructed a full WFST-based dialog system by composing SLU, scenario and sentence generation (SG) WFSTs. We show an example of a hotel reservation dialog with the fully composed system and discuss future work.

Full Paper

Bibliographic reference.  Hori, Chiori / Ohtake, Kiyonori / Misu, Teruhisa / Kashioka, Hideki / Nakamura, Satoshi (2009): "Recent advances in WFST-based dialog system", In INTERSPEECH-2009, 268-271.