no code implementations • 29 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.
no code implementations • 25 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
no code implementations • 23 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.
no code implementations • 2 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.
no code implementations • 16 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.
no code implementations • 27 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.
1 code implementation • 31 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.
no code implementations • 10 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.
2 code implementations • 23 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.
1 code implementation • 11 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.
no code implementations • 16 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.