Hybrid example-based SMT: the best of both worlds?
Groves, Declan and Way, Andy (2005) Hybrid example-based SMT: the best of both worlds? In: ACL 2005 Workshop on Building and Using Parallel Texts, 29-30 June 2005, Ann Arbor, MI, USA.
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(Way and Gough, 2005) provide an indepth comparison of their Example-Based Machine Translation (EBMT) system with
a Statistical Machine Translation (SMT) system constructed from freely available tools. According to a wide variety of automatic evaluation metrics, they demonstrated
that their EBMT system outperformed the SMT system by a factor of two to one.
Nevertheless, they did not test their EBMT system against a phrase-based SMT system. Obtaining their training and test
data for English–French, we carry out a number of experiments using the Pharaoh SMT Decoder. While better results are seen when Pharaoh is seeded with Giza++
word- and phrase-based data compared to EBMT sub-sentential alignments, in general better results are obtained when combinations of this 'hybrid' data is used to construct the translation and probability models. While for the most part the EBMT system of (Gough & Way, 2004b) outperforms any flavour of the phrasebased SMT systems constructed in our
experiments, combining the data sets automatically induced by both Giza++ and their EBMT system leads to a hybrid system which improves on the EBMT system per se for French–English.
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