Phase transition in a random NK landscape model

  • Authors:
  • Sung-Soon Choi;Kyomin Jung;Jeong Han Kim

  • Affiliations:
  • School of Computer Science and Engineering, Seoul National University, Seoul, 151-742 Korea;Department of Mathematics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA;Department of Mathematics, Yonsei University, Seoul, 120-749 Korea

  • Venue:
  • Artificial Intelligence
  • Year:
  • 2008

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Abstract

An analysis for the phase transition in a random NK landscape model, NK(n,k,z), is given. This model is motivated from population genetics and the solubility problem for the model is equivalent to a random (k+1)-SAT problem. Gao and Culberson [Y. Gao, J. Culberson, An analysis of phase transition in NK landscapes, Journal of Artificial Intelligence Research 17 (2002) 309-332] showed that a random instance generated by NK(n,2,z) with zz"0=27-754 is asymptotically insoluble. Based on empirical results, they conjectured that the phase transition occurs around the value z=z"0. We prove that an instance generated by NK(n,2,z) with zz"0 is asymptotically insoluble. The results show the phase transition around z=z"0 for NK(n,2,z). In the course of the analysis, we introduce a generalized random 2-SAT formula, which is of self interest, and show its phase transition phenomenon.