To capture common semantics of multilingual news reader comments, we design two auxiliary distri- butions η e , with dimension Λ e , and η c , with dimension Λ c , to help the generation of ϕ e k and ϕ c k .
we generate η e and η c from the Dirichlet prior distributions Dir(β •1 |Λ e | ) and Dir(β •1 |Λ c | ) respectively, where 1 D denotes a D-dimensional vector whose components are 1.