ISCA Archive Interspeech 2012
ISCA Archive Interspeech 2012

A discriminative classification-based approach to information state updates for a multi-domain dialog system

Dilek Hakkani-Tür, Gokhan Tur, Larry Heck, Ashley Fidler, Asli Celikyilmaz

We propose a discriminative classification approach for updating the current information state of a multi-domain dialog system based on user responses. Our method uses a set of lexical and domain independent features to compare the spoken language understanding (SLU) output for the current user turn with the previous information state. We then update the information state accordingly, employing a discriminative machine learning approach. Using a data set collected from our conversational interaction system, we investigate the impact of features based on context dependent and context independent SLU tagging schemas. We show that the proposed approach outperforms two non-trivial baselines, one based on manually crafted rules and the other on classification with lexical features alone. Furthermore, such an approach allows the addition of new domains to the dialog manager in a seamless way.

Index Terms: multi-domain spoken dialog systems, multi-turn spoken language understanding, learning information state updates