Schemata evolution and building blocks

  • Authors:
  • Chris Stephens;Henri Waelbroeck

  • Affiliations:
  • Instituto de Ciencias Nucleares, UNAM Circuito Exterior, A.Postal 70-543 México D.F. 04510 stephens@nuclecu.unam.mx;Instituto de Ciencias Nucleares, UNAM Circuito Exterior, A.Posta1 70-543 México D.F. 04510 hwael@nuclecu.unam.mx

  • Venue:
  • Evolutionary Computation
  • Year:
  • 1999

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Abstract

In the light of a recently derived evolution equation for genetic algorithms we consider the schema theorem and the building block hypothesis. We derive a schema theorem based on the concept of effective fitness showing that schemata of higher than average effective fitness receive an exponentially increasing number of trials over time. The equation makes manifest the content of the building block hypothesis showing how fit schemata are constructed from fit sub-schemata. However, we show that, generically, there is no preference for short, low-order schemata. In the case where schema reconstruction is favored over schema destruction, large schemata tend to be favored. As a corollary of the evolution equation we prove Geiringer's theorem.