Estimating phrase pair relevance for translation model pruning Matthias Eck author Stephan Vogel author Alex Waibel author 2007-sep 10-14 text Proceedings of Machine Translation Summit XI: Papers Bente Maegaard editor Copenhagen, Denmark conference publication eck-etal-2007-estimating https://aclanthology.org/2007.mtsummit-papers.22/ 2007-sep 10-14