We use Mallet's (McCallum, 2002) implementation of the PLTM to train and infer topics on the same data set used in Platt et al. (2010) . That paper used the Europarl (Koehn, 2005)<cite> (Mimno et al., 2009)</cite> , these performance comparisons are not done on the same training and test sets-a gap that we fill below.