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Statistical Machine Translation by Philipp Koehn

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Chapter 11

Tree-Based Models

Linguistic theories of syntax build on a recursive representation of sentences, which are referred to as syntactic trees. However, the models for statistical machine translation that we presented in previous chapters operate on a flat sequence representation of sentences – the idea that a sentence is a string of words. Since syntactic trees equip us to exploit the syntactic relationships between words and phrases, it is an intriguing proposition to build models for machine translation based on tree structures.

This line of research in statistical machine translation has been pursued for many years. Recently, some core methods have crystalized and translation systems employing tree-based models have been demonstrated ...

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