[edit]
The Hierarchical Dirichlet Process Hidden Semi-Markov Model
Proceedings of the 26th Conference on Uncertainty in Artificial Intelligence, PMLR R8:260-267, 2010.
Abstract
There is much interest in the Hierarchi- cal Dirichlet Process Hidden Markov Model (HDP-HMM) as a natural Bayesian nonpara- metric extension of the traditional HMM. However, in many settings the HDP-HMM’s strict Markovian constraints are undesirable, particularly if we wish to learn or encode non-geometric state durations. We can ex- tend the HDP-HMM to capture such struc- ture by drawing upon explicit-duration semi- Markovianity, which has been developed in the parametric setting to allow construction of highly interpretable models that admit natural prior information on state durations. In this paper we introduce the explicit- duration HDP-HSMM and develop posterior sampling algorithms for efficient inference in both the direct-assignment and weak-limit approximation settings. We demonstrate the utility of the model and our inference meth- ods on synthetic data as well as experiments on a speaker diarization problem and an ex- ample of learning the patterns in Morse code.