Interpolated Backoff for Factored Translation Models.
Philipp Koehn, Barry Haddow · Conference of the Association for Machine Translation in the Americas · 2012
We propose interpolated backoff methods to strike the balance between traditional surface form translation models and factored models that decompose translation into lemma and morphological feature mapping steps. We show that this approach improves translation quality by 0.5 BLEU (German–English) over phrase-based models, due to the better translation of rare nouns and adjectives.