Orthogonal parallel MCMC methods for sampling and optimization Articles uri icon

authors

  • MARTINO, LUCA
  • ELVIRA ARREGUI, VICTOR
  • LUENGO GARCIA, DAVID
  • CORANDER, J.
  • LOUZADA, F.

publication date

  • November 2016

start page

  • 64

end page

  • 84

volume

  • 58

International Standard Serial Number (ISSN)

  • 1051-2004

Electronic International Standard Serial Number (EISSN)

  • 1095-4333

abstract

  • Monte Carlo (MC) methods are widely used for Bayesian inference and optimization in statistics, signal processing and machine learning. A well-known class of MC methods are Markov Chain Monte Carlo (MCMC) algorithms. In order to foster better exploration of the state space, specially in high dimensional applications, several schemes employing multiple parallel MCMC chains have been recently introduced. In this work, we describe a novel parallel interacting MCMC scheme, called orthogonal MCMC (O-MCMC), where a set of "vertical" parallel MCMC chains share information using some "horizontal" MCMC techniques working on the entire population of current states. More specifically, the vertical chains are led by random-walk proposals, whereas the horizontal MCMC techniques employ independent proposals, thus allowing an efficient combination of global exploration and local approximation. The interaction is contained in these horizontal iterations. Within the analysis of different implementations of O-MCMC, novel schemes in order to reduce the overall computational cost of parallel Multiple Try Metropolis (MTM) chains are also presented. Furthermore, a modified version of O-MCMC for optimization is provided by considering parallel Simulated Annealing (SA) algorithms. Numerical results show the advantages of the proposed sampling scheme in terms of efficiency in the estimation, as well as robustness in terms of independence with respect to initial values and the choice of the parameters. (C) 2016 Elsevier Inc. All rights reserved.

subjects

  • Telecommunications

keywords

  • bayesian inference; optimization; parallel markov chain monte carlo; parallel multiple try metropolis; block independent metropolis; parallel simulated annealing; chain monte-carlo; metropolis-hastings algorithms; global optimization; inference; convergence; model; simulation; frequency; rejection; filter