Observatorio de I+D+i UPM

Memorias de investigación
Otras publicaciones:
An Adaptive Population Importance Sampler: Learning from Uncertainty
Año:2014
Áreas de investigación
  • Inferencia de procesos estocásticos,
  • Inferencia no paramétrica
Datos
Descripción
Monte Carlo (MC) methods are well-known computational techniques, widely used in different fields such as signal processing, communications and machine learning. An important class of MC methods is composed of importance sampling (IS) and its adaptive extensions, such as population Monte Carlo (PMC) and adaptive multiple IS (AMIS). In this work, we introduce a novel adaptive and iterated importance sampler using a population of proposal densities. The proposed algorithm, named adaptive population importance sampling (APIS), provides a global estimation of the variables of interest iteratively, making use of all the samples previously generated. APIS combines a sophisticated scheme to build the IS estimators (based on the deterministic mixture approach) with a simple temporal adaptation (based on epochs). In this way, APIS is able to keep all the advantages of both AMIS and PMC, while minimizing their drawbacks. Furthermore, APIS is easily parallelizable. The cloud of proposals is adapted in such a way that local features of the target density can be better taken into account compared to single global adaptation procedures. The result is a fast, simple, robust and high-performance algorithm applicable to a wide range of problems. Numerical results show the advantages of the proposed sampling scheme in four synthetic examples and a localization problem in a wireless sensor network.
Internacional
Si
Entidad
Lugar
Páginas
Referencia/URL
http://vixra.org/abs/1405.0280
Tipo de publicación
Informe Técnico en viXra
Esta actividad pertenece a memorias de investigación
Participantes
  • Autor: David Luengo Garcia (UPM)
Grupos de investigación, Departamentos, Centros e Institutos de I+D+i relacionados
  • Creador: Grupo de Investigación: Teoría de Aproximación Constructiva y Aplicaciones
  • Departamento: Teoría de la Señal y Comunicaciones (Provisional)
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