Goldwater, Sharon

Griffiths, Thomas L.

Johnson, Mark

Johnson, Mark Edward

Griffiths, Thomas L

Goldwater, S

Macquarie University ResearchOnline

Adaptor Grammars: A Framework for Specifying Compositional Nonparametric Bayesian Models

This paper introduces adaptor grammars, a class of probabilistic models of language that generalize probabilistic context-free grammars (PCFGs). Adaptor grammars augment the probabilistic rules of PCFGs with "adaptors" that can induce dependencies among successive uses. With a particular choice of adaptor, based on the Pitman-Yor process, nonparametric Bayesian models of language using Dirichlet processes and hierarchical Dirichlet processes can be written as simple grammars. We present a general-purpose inference algorithm for adaptor grammars, making it easy to define and use such models, and illustrate how several existing nonparametric Bayesian models can be expressed within this framework

Adaptor Grammars: A Framework for Specifying Compositional Nonparametric Bayesian Models

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