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Poster
Inference in Deep Gaussian Processes using Stochastic Gradient Hamiltonian Monte Carlo
Marton Havasi · José Miguel Hernández-Lobato · Juan J. Murillo-Fuentes

Thu Dec 06 07:45 AM -- 09:45 AM (PST) @ Room 210 #65
in Thu Poster Session A »

Deep Gaussian Processes (DGPs) are hierarchical generalizations of Gaussian Processes that combine well calibrated uncertainty estimates with the high flexibility of multilayer models. One of the biggest challenges with these models is that exact inference is intractable. The current state-of-the-art inference method, Variational Inference (VI), employs a Gaussian approximation to the posterior distribution. This can be a potentially poor unimodal approximation of the generally multimodal posterior. In this work, we provide evidence for the non-Gaussian nature of the posterior and we apply the Stochastic Gradient Hamiltonian Monte Carlo method to generate samples. To efficiently optimize the hyperparameters, we introduce the Moving Window MCEM algorithm. This results in significantly better predictions at a lower computational cost than its VI counterpart. Thus our method establishes a new state-of-the-art for inference in DGPs.

Keywords: MCMC · Gaussian Processes · Predictive Models · Latent Variable Models

Author Information

Marton Havasi (University of Cambridge)
José Miguel Hernández-Lobato (University of Cambridge)
Juan J. Murillo-Fuentes (Universidad de Sevilla)

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