Computational Intelligence: Theory and Applications, B. Reusch (ed.),
Lecture Notes in Computer Science 2206, pp. 739-748,
Springer-Verlag Berlin, 2001
This work studies the edge-based representation of directed
acyclic graphs, as well as the properties of recombination
operators working on it. It is shown that this representation is
not separable, and the structure of the basic information units
that must be processed in order to maintain feasibility of the
solutions is described. As an experimental analysis indicates, a
recombination operator using these units has sub-quadratic
complexity in the graph size. It is also shown that a standard
gene-transmission recombination operator is biased to produce
solutions of lower edge-density than the parents' average. An
unbiased allelic recombination operator provides better results on
an ad-hoc test problem.