Since we want the model to learn to rank y i overỹ j , we would have to sampleỹ i word-byword from p + θ andỹ j from p − θ .
sampling all words ofỹ j from p − θ leads to translations that are neither fluent nor source-related, so we propose to randomly choose one position of y j where the next word is sampled from p − θ and sample the remaining words from p + θ .