Previous phrase alignment work has primarily mitigated this tendency by constraining the inference procedure, for example with word alignments and linguistic features (Birch et al., 2006), or by disallowing large phrase pairs using a noncompositional constraint (Cherry and Lin, 2007;Zhang et al., 2008).
similarly, we can parameterize the Dirichlet process with a concentration parameter α (that affects only the variance) and a base distribution M 0 that determines the mean of the samples.