Our training strategy is mostly the same as for the document categorization experiments, although for some parameters, such as the number of topics and vMF mixture components, we used larger values, which is a reflection of the fact that the collections used in this experiment are substantially larger and tend to be more diverse (Wei and Croft, 2006).
the word vector lengths were chosen from a pool of {150, 200, 300} and the vMF mixtures from a pool of {300, 1000, 3000}.