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Adaptive Population Models for Offspring Populations and Parallel Evolutionary Algorithms.

Fri, 02/04/2011 - 16:01 — SomNambul
Authors: Jörg Lässig, Dirk Sudholt
Subjects: Computational Complexity
link: http://arxiv.org/abs/1102.0588
Abstract

A central question when parallelizing evolutionary algorithms is the choice
of the number of parallel instances. In practice optimal parameter settings are
often hard to find due to limited information about the optimization problem
under consideration. We present two adaptive schemes for dynamically choosing
the number of instances in each generation. These schemes work in a black-box
setting where no knowledge on the function at hand is available. Both schemes
provide near-optimal speed-ups in terms of the parallel time while not
increasing the number of function evaluations in an asymptotic sense, compared
to upper bounds via the fitness-level method. It turns out that the
optimization of the offspring population size in a (1+$\lambda$)-EA is just a
special case in this context, so our schemes and results also work for the
choice of the offspring population size.

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