Book Reviews Genetic Algorithms + Data Structures = Evolution Programs by Zbigniew Michalewicz Springer-Verlag, 1992 Hard cover, 250 + xiv pages ISBN 3-540-55387-8 Reviewed by: Michael de la Maza Numinous Noetics Group MIT AI Lab Cambridge, MA 02139 Like a good politician, Michalewicz begins by reducing expectations (he quotes Anthony de Mello: "[The Master] only points the way - he teaches nothing") and follows with a book that is a hodgepodge of introductory material and original work. The subject of the book, as the title suggests, is the study of evolution programs, which are genetic algorithms augmented by novel genetic operators and domain dependent d a t a structures. Indeed, a better title for the book would be: Some of the errors in the book are serious. The genetic algorithm selection function, which assigns to each individual the probability that it will participate in the formation of the next generation, requires that the fitness of each individual be positive. At the beginning of chapter 2, Michalewicz writes that any bounded fitness function that assigns negative fitnesses to individuals can be changed into a function that is always positive by adding a positive constant to the function. This is
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