Multi-valued control problems and mixture density network

Randa Herzallah, David Lowe

Research output: Chapter in Book/Report/Conference proceedingConference publication

Abstract

We have proposed a novel robust inversion-based neurocontroller that searches for the optimal control law by sampling from the estimated Gaussian distribution of the inverse plant model. However, for problems involving the prediction of continuous variables, a Gaussian model approximation provides only a very limited description of the properties of the inverse model. This is usually the case for problems in which the mapping to be learned is multi-valued or involves hysteritic transfer characteristics. This often arises in the solution of inverse plant models. In order to obtain a complete description of the inverse model, a more general multicomponent distributions must be modeled. In this paper we test whether our proposed sampling approach can be used when considering an arbitrary conditional probability distributions. These arbitrary distributions will be modeled by a mixture density network. Importance sampling provides a structured and principled approach to constrain the complexity of the search space for the ideal control law. The effectiveness of the importance sampling from an arbitrary conditional probability distribution will be demonstrated using a simple single input single output static nonlinear system with hysteretic characteristics in the inverse plant model.
Original languageEnglish
Title of host publicationIntelligent Control Systems and Signal Processing 2003
Subtitle of host publicationIPV-IFAC Proceedings
EditorsAntónio E. de Barros Ruano
PublisherAustralian Academic Press
Pages387-392
Number of pages6
Volume2
ISBN (Print)978-0-08044088-0
Publication statusPublished - Apr 2003
EventIFAC International Conference on Intelligent Control Systems and Signal Processing - Faro, Portugal
Duration: 1 Apr 20031 Apr 2003

Conference

ConferenceIFAC International Conference on Intelligent Control Systems and Signal Processing
Abbreviated titleICONS
CountryPortugal
CityFaro
Period1/04/031/04/03

Keywords

  • inversion-based neurocontroller
  • Gaussian distribution
  • prediction of continuous variables
  • Gaussian model approximation
  • hysteritic transfer characteristics
  • inverse plant models
  • multicomponent distribution
  • arbitrary conditional probability distributions
  • sampling
  • Neural Networks

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  • Cite this

    Herzallah, R., & Lowe, D. (2003). Multi-valued control problems and mixture density network. In A. E. de Barros Ruano (Ed.), Intelligent Control Systems and Signal Processing 2003: IPV-IFAC Proceedings (Vol. 2, pp. 387-392). Australian Academic Press.