Although more complex representations are possible, we generate meta-features for each sentence based solely on operations on the estimated distributions, p θ C (y d , y s i |s).
we encode the following probability distributions as discrete features by uniform bucketing, with bucket width 0.1: the joint distribution, p θ C (y d , y s i |s); the marginal document distribution, p θ C (y d |s); and the marginal sentence distribution, p θ C (y s i |s).