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Statistical Machine Translation by Philipp Koehn

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Chapter 5

Phrase-Based Models

The currently best performing statistical machine translation systems are based on phrase-based models: models that translate small word sequences at a time. This chapter explains the basic principles of phrase-based models and how they are trained, and takes a more detailed look at extensions to the main components: the translation model and the reordering model. The next chapter will explain the algorithms that are used to translate sentences using these models.

5.1 Standard Model

First, we lay out the standard model for phrase-based statistical machine translation. While there are many variations, these can all be seen as extensions to this model.

5.1.1 Motivation for Phrase-Based Models

The previous chapter introduced ...

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