In keeping with the formulation in Section 3 we opt for a probabilistic interpretation of NMF (Gaussier and Goutte, 2005;Ding et al., 2008) and thus minimize the KL divergence between W H and V .
we interpret matrix V as V ij = P (t i , c j ), and matrices W and H as P (t i , z k ) and P (c j |z k ), respectively.