Syntax-based Statistical Machine Translation

Philip Williams, Rico Sennrich, Matt Post, Philipp Koehn

Research output: Chapter in Book/Report/Conference proceedingChapter

Abstract

This unique book provides a comprehensive introduction to the most popular syntax-based statistical machine translation models, filling a gap in the current literature for researchers and developers in human language technologies. While phrase-based models have previously dominated the field, syntax-based approaches have proved a popular alternative, as they elegantly solve many of the shortcomings of phrase-based models. The heart of this book is a detailed introduction to decoding for syntax-based models.

The book begins with an overview of synchronous-context free grammar (SCFG) and synchronous tree-substitution grammar (STSG) along with their associated statistical models. It also describes how three popular instantiations (Hiero, SAMT, and GHKM) are learned from parallel corpora. It introduces and details hypergraphs and associated general algorithms, as well as algorithms for decoding with both tree and string input. Special attention is given to efficiency, including search approximations such as beam search and cube pruning, data structures, and parsing algorithms. The book consistently highlights the strengths (and limitations) of syntax-based approaches, including their ability to generalize phrase-based translation units, their modeling of specific linguistic phenomena, and their function of structuring the search space.
Original languageEnglish
Title of host publicationSynthesis Lectures on Human Language Technologies
PublisherMorgan & Claypool Publishers
Pages1-208
Number of pages208
Volume9
Edition4
DOIs
Publication statusPublished - Aug 2016

Publication series

NameSynthesis Lectures on Human Language Technologies
PublisherMorgan & Claypool Publishers
Volume9
ISSN (Print)1947-4040

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