Furthermore, when P (D|f ) is approximated as P (D) = D λ , and the general translation model P (f |e) is used instead of the domain specific translation model P (f |e, D), this equation represents the process of translation using sentence mixture language models (Iyer et al., 1993) as follows: The points that differ from the proposed method are as follows: • In the sentence mixture model, the mixture weight parameters D λ are constant.
in the proposed method, weight parameters P (D|f ) are estimated separately for each sentence.