Search Results for author: Omiros Papaspiliopoulos

Found 6 papers, 3 papers with code

Partially factorized variational inference for high-dimensional mixed models

2 code implementations20 Dec 2023 Max Goplerud, Omiros Papaspiliopoulos, Giacomo Zanella

We also provide generic results, which are of independent interest, relating the accuracy of variational inference to the convergence rate of the corresponding coordinate ascent variational inference (CAVI) algorithm for Gaussian targets.

Uncertainty Quantification Variational Inference

Bayesian prediction of jumps in large panels of time series data

no code implementations28 Mar 2019 Angelos Alexopoulos, Petros Dellaportas, Omiros Papaspiliopoulos

We take a new look at the problem of disentangling the volatility and jumps processes of daily stock returns.

Time Series Time Series Analysis

Scalable inference for crossed random effects models

no code implementations26 Mar 2018 Omiros Papaspiliopoulos, Gareth O. Roberts, Giacomo Zanella

We analyze the complexity of Gibbs samplers for inference in crossed random effect models used in modern analysis of variance.

Dimension-Robust MCMC in Bayesian Inverse Problems

no code implementations9 Mar 2018 Victor Chen, Matthew M. Dunlop, Omiros Papaspiliopoulos, Andrew M. Stuart

One popular formulation of such problems is as Bayesian inverse problems, where a prior distribution is used to regularize inference on a high-dimensional latent state, typically a function or a field.

Active Learning Efficient Exploration +4

Auxiliary gradient-based sampling algorithms

1 code implementation30 Oct 2016 Michalis K. Titsias, Omiros Papaspiliopoulos

We introduce a new family of MCMC samplers that combine auxiliary variables, Gibbs sampling and Taylor expansions of the target density.

Binary Classification

A General Framework for the Parametrization of Hierarchical Models

1 code implementation28 Aug 2007 Omiros Papaspiliopoulos, Gareth O. Roberts, Martin Sköld

In this paper, we describe centering and noncentering methodology as complementary techniques for use in parametrization of broad classes of hierarchical models, with a view to the construction of effective MCMC algorithms for exploring posterior distributions from these models.

Methodology

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