- Exact Decoding for Phrase-Based Statistical Machine Translation
- 2014 Empirical Methods in Natural Language Processing (EMNLP)
- Book/source title
- EMNLP 2014: the 2014 Conference on Empirical Methods In Natural Language Processing: proceedings of the conference: October 25-29, 2014, Doha, Qatar
- Pages (from-to)
- Stroudsburg, PA: Association for Computational Linguistics
- Document type
- Conference contribution
- Faculty of Science (FNWI)
- Informatics Institute (IVI)
The combinatorial space of translation derivations in phrase-based statistical machine translation is given by the intersection between a translation lattice and a target language model. We replace this intractable intersection by a tractable relaxation which incorporates a low-order upperbound on the language model. Exact optimisation is achieved through a coarse-to-fine strategy with connections to adaptive rejection sampling. We perform exact optimisation with unpruned language models of order 3 to 5 and show search-error curves for beam search and cube pruning on standard test sets. This is the first work to tractably tackle exact optimisation with language models of orders higher than 3.
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