Paper: Unsupervised Topic Modelling For Multi-Party Spoken Discourse

ACL ID P06-1003
Title Unsupervised Topic Modelling For Multi-Party Spoken Discourse
Venue Annual Meeting of the Association of Computational Linguistics
Session Main Conference
Year 2006
Authors

We present a method for unsupervised topic modelling which adapts methods used in document classification (Blei et al. , 2003; Griffiths and Steyvers, 2004) to unsegmented multi-party discourse tran- scripts. We show how Bayesian infer- ence in this generative model can be used to simultaneously address the prob- lems of topic segmentation and topic identification: automatically segmenting multi-party meetings into topically co- herent segments with performance which compares well with previous unsuper- vised segmentation-only methods (Galley et al. , 2003) while simultaneously extract- ingtopicswhichratehighlywhenassessed for coherence by human judges. We also show that this method appears robust in the face of off-topic dialogue and speech recognition errors.