We combine this model with the Bayesian nonparametric Pitman-Yor process (Pitman and Yor, 1997;Teh, 2006), realizing ITG-based divide and conquer through a novel formulation where the Pitman-Yor process uses two copies of itself as a base measure.
of this modeling strategy, phrases of multiple granularities are generated, and thus memorized, by the Pitman-Yor process.