Efficiency improvement in an nD systems approach to polynomial optimization

  • Authors:
  • Ivo Bleylevens;Ralf Peeters;Bernard Hanzon

  • Affiliations:
  • Department of Mathematics, Universiteit Maastricht, Maastricht, The Netherlands;Department of Mathematics, Universiteit Maastricht, Maastricht, The Netherlands;School of Mathematical Sciences, University College Cork, Cork, Ireland

  • Venue:
  • Journal of Symbolic Computation
  • Year:
  • 2007

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Abstract

The problem of finding the global minimum of a so-called Minkowski-norm dominated polynomial can be approached by the matrix method of Stetter and Moller, which reformulates it as a large eigenvalue problem. A drawback of this approach is that the matrix involved is usually very large. However, all that is needed for modern iterative eigenproblem solvers is a routine which computes the action of the matrix on a given vector. This paper focuses on improving the efficiency of computing the action of the matrix on a vector. To avoid building the large matrix one can associate the system of first-order conditions with an nD system of difference equations. One way to compute the action of the matrix efficiently is by setting up a corresponding shortest path problem and solving it. It turns out that for large n the shortest path problem has a high computational complexity, and therefore some heuristic procedures are developed for arriving cheaply at suboptimal paths with acceptable performance.