Search Results for author: Mattias Villani

Found 11 papers, 3 papers with code

A Multilayered Block Network Model to Forecast Large Dynamic Transportation Graphs: an Application to US Air Transport

no code implementations29 Nov 2019 Hector Rodriguez-Deniz, Mattias Villani, Augusto Voltes-Dorta

Dynamic transportation networks have been analyzed for years by means of static graph-based indicators in order to study the temporal evolution of relevant network components, and to reveal complex dependencies that would not be easily detected by a direct inspection of the data.

Bayesian Inference Data Augmentation +3

Spatial 3D Matérn priors for fast whole-brain fMRI analysis

no code implementations25 Jun 2019 Per Sidén, Finn Lindgren, David Bolin, Anders Eklund, Mattias Villani

Bayesian whole-brain functional magnetic resonance imaging (fMRI) analysis with three-dimensional spatial smoothing priors have been shown to produce state-of-the-art activity maps without pre-smoothing the data.

Methodology Applications Computation

Subsampling MCMC - An introduction for the survey statistician

no code implementations23 Jul 2018 Matias Quiroz, Mattias Villani, Robert Kohn, Minh-Ngoc Tran, Khue-Dung Dang

The rapid development of computing power and efficient Markov Chain Monte Carlo (MCMC) simulation algorithms have revolutionized Bayesian statistics, making it a highly practical inference method in applied work.

Survey Sampling

Hamiltonian Monte Carlo with Energy Conserving Subsampling

no code implementations2 Aug 2017 Khue-Dung Dang, Matias Quiroz, Robert Kohn, Minh-Ngoc Tran, Mattias Villani

The key insight in our article is that efficient subsampling HMC for the parameters is possible if both the dynamics and the acceptance probability are computed from the same data subsample in each complete HMC iteration.

Tree Ensembles with Rule Structured Horseshoe Regularization

no code implementations16 Feb 2017 Malte Nalenz, Mattias Villani

The aggressive noise shrinkage of our prior also makes it possible to complement the rules from boosting in Friedman and Popescu (2008) with an additional set of trees from random forest, which brings a desirable diversity to the ensemble.

General Classification regression

The block-Poisson estimator for optimally tuned exact subsampling MCMC

no code implementations27 Mar 2016 Matias Quiroz, Minh-Ngoc Tran, Mattias Villani, Robert Kohn, Khue-Dung Dang

A pseudo-marginal MCMC method is proposed that estimates the likelihood by data subsampling using a block-Poisson estimator.

DOLDA - a regularized supervised topic model for high-dimensional multi-class regression

1 code implementation31 Jan 2016 Måns Magnusson, Leif Jonsson, Mattias Villani

Generating user interpretable multi-class predictions in data rich environments with many classes and explanatory covariates is a daunting task.

General Classification Multi-class Classification +2

Scalable MCMC for Large Data Problems using Data Subsampling and the Difference Estimator

no code implementations10 Jul 2015 Matias Quiroz, Mattias Villani, Robert Kohn

We propose a generic Markov Chain Monte Carlo (MCMC) algorithm to speed up computations for datasets with many observations.

Survey Sampling

Bayesian optimisation for fast approximate inference in state-space models with intractable likelihoods

2 code implementations23 Jun 2015 Johan Dahlin, Mattias Villani, Thomas B. Schön

We consider the problem of approximate Bayesian parameter inference in non-linear state-space models with intractable likelihoods.

Bayesian Optimisation

Sparse Partially Collapsed MCMC for Parallel Inference in Topic Models

1 code implementation11 Jun 2015 Måns Magnusson, Leif Jonsson, Mattias Villani, David Broman

We propose a parallel sparse partially collapsed Gibbs sampler and compare its speed and efficiency to state-of-the-art samplers for topic models on five well-known text corpora of differing sizes and properties.

Topic Models

Speeding Up MCMC by Efficient Data Subsampling

no code implementations16 Apr 2014 Matias Quiroz, Robert Kohn, Mattias Villani, Minh-Ngoc Tran

We propose Subsampling MCMC, a Markov Chain Monte Carlo (MCMC) framework where the likelihood function for $n$ observations is estimated from a random subset of $m$ observations.

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