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title
Collapsed Gibbs Sampling for LDA and Bayesian Naive Bayes | Information Retrieval Blog
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Sent to you by Jeff via Google Reader: Collapsed Gibbs Sampling for LDA and Bayesian Naive Bayes via LingPipe Blog by lingpipe on 7/13/10 I've uploaded a short (though dense) tech report that works through the collapsing of Gibbs samplers for latent Dirichlet allocation (LDA) and the Bayesian formulation of naive Bayes (NB). Carpenter, Bob. 2010. Integrating out multinomial parameters in latent Dirichlet allocation and naive Bayes for collapsed Gibbs sampling. LingPipe Technical Report. Thomas L. Griffiths and Mark Steyvers used the collapsed sampler for LDA in their (old enough to be open access) PNAS paper, Finding scientific topics. They show the final form, but don't derive the integral or provide a citation. I suppose these 25-step integrals are supposed to be child's play. Maybe they are if you're a physicist or theoretical statistician. But that was a whole lot of choppin' with the algebra and the calculus for a simple country computational linguist like me. ...
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