A Hierarchical Bayesian Language Model based on Pitman-Yor Processes

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• Matt Shannon (University of Cambridge)
• Thursday 22 January 2009, 14:00-15:30
• Engineering Department, CBL Room 438.

If you have a question about this talk, please contact Shakir Mohamed.

I will be discussing:

• A Hierarchical Bayesian Language Model based on Pitman-Yor Processes, Yee Whye Teh, http://www.gatsby.ucl.ac.uk/~ywteh/research/bayesnlp/acl2006.pdf

N-gram language modelling traditionally uses some form of “smoothing” technique to allocate some probability mass to unseen N-grams. Over the years people have come up with smoothing schemes that perform pretty well, but it’s not easy to get a handle on what they’re doing, and how to improve them.

In this paper, Teh shows that a hierarchical Bayesian language model with a very simplistic model of context performs pretty much as well as the current state of the art smoothing schemes, and in fact has strong similarities to an existing smoothing scheme.

This talk is part of the Machine Learning Reading Group @ CUED series.

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