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arXiv · 1611.07460

Poisson Random Fields for Dynamic Feature Models

Valerio Perrone·Paul A. Jenkins·Dario Spano·Yee Whye Teh
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Abstract

We present the Wright-Fisher Indian buffet process (WF-IBP), a probabilistic model for time-dependent data assumed to have been generated by an unknown number of latent features. This model is suitable as a prior in Bayesian nonparametric feature allocation models in which the features underlying the observed data exhibit a dependency structure over time. More specifically, we establish a new framework for generating dependent Indian buffet processes, where the Poisson random field model from population genetics is used as a way of constructing dependent beta processes. Inference in the model is complex, and we describe a sophisticated Markov Chain Monte Carlo algorithm for exact posterior simulation. We apply our construction to develop a nonparametric focused topic model for collections of time-stamped text documents and test it on the full corpus of NIPS papers published from 1987 to 2015.

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Valerio Perrone, Paul A. Jenkins, Dario Spano, Yee Whye Teh. 2016-11-22. Poisson Random Fields for Dynamic Feature Models. https://arxiv.org/abs/1611.07460

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