The scalars λ 1 and λ 2 are hyperparameters.
the posterior distribution of the hidden variables for each word w dv,i (i-th word in venue document d v ) is calculated as follows (to simplify, we use Θ to refer to s,z ) (1) where n u,c (0) and n u,c (1) are the numbers of times that c = 0 and c = 1 are sampled for user u, respectively, and we have n u,c n u,c (0) +n u,c (1).