Sample topic and discourse assignments z and d at the message level and word type switcher x at the word level, using the distributions, computed according to parameters optimized in step 1: Step 2 is analogous to Gibbs Sampling (Griffiths, 2002) in probabilistic graphical models, such as LDA (Blei et al., 2003).
distinguishing from previous models, the multinomial distributions in our models are not drawn from a Dirichlet prior.