On realizability of neural networks-based input-output models in the classical state-space form

  • Authors:
  • í. Kotta;F. N. Chowdhury;S. NíMm

  • Affiliations:
  • Institute of Cybernetics, Tallinn University of Technology, Akadeemia tee 21, Tallinn 12618, Estonia;University of Louisiana at Lafayette, P.O. Box 43890, Lafayette, LA 70504-3890, USA;Institute of Cybernetics, Tallinn University of Technology, Akadeemia tee 21, Tallinn 12618, Estonia

  • Venue:
  • Automatica (Journal of IFAC)
  • Year:
  • 2006

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Abstract

This paper proves that the typical neural network-based input/output model does not have a state-space realization and suggests the Additive Nonlinear Auto-Regressive with eXogenous input (ANARX) structure as an excellent choice for neural-network-based input-output models. The advantage of the ANARX model is that the time-steps in the argument are pair-wise decomposed, which allows the ANARX model to be realized in state space, and to be linearized via dynamic output feedback. Moreover, accessibility of the state-space realization has been proved.