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Bayesian Models for Dependency Parsing Using Pitman-Yor Priors

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If you have a question about this talk, please contact David MacKay.

In this talk, I will introduce a Bayesian dependency parsing model for natural language, based on the hierarchical Pitman-Yor process. This model arises from a Bayesian reinterpretation of a classic dependency parser. I will show that parsing performance can be substantially improved by (a) using a hierarchical Pitman-Yor process as a prior over the distribution over dependents of a word, and (b) sampling model hyperparameters. Finally, I will present a second Bayesian dependency model in which latent state variables mediate the relationships between words and their dependents. This model clusters parent-child dependencies into states using a similar approach to that employed by Bayesian topic models when clustering words into topics. Each latent state may be viewed as a sort of specialised part-of-speech tag or “syntactic topic” that captures the relationships between words and their dependents.

This talk is part of the Inference Group series.

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