Paper: Beyond Left-to-Right: Multiple Decomposition Structures for SMT

ACL ID N13-1002
Title Beyond Left-to-Right: Multiple Decomposition Structures for SMT
Venue Annual Conference of the North American Chapter of the Association for Computational Linguistics
Session Main Conference
Year 2013
Authors

Standard phrase-based translation models do not explicitly model context dependence be- tween translation units. As a result, they rely on large phrase pairs and target language mod- els to recover contextual effects in translation. In this work, we explore n-gram models over Minimal Translation Units (MTUs) to explic- itly capture contextual dependencies across phrase boundaries in the channel model. As there is no single best direction in which con- textual information should flow, we explore multiple decomposition structures as well as dynamic bidirectional decomposition. The resulting models are evaluated in an intrin- sic task of lexical selection for MT as well as a full MT system, through n-best rerank- ing. These experiments demonstrate that ad- ditional contextual modeling does in...