Convergence Properties of Evolution Strategies with the Derandomized Covariance Matrix Adaptation: The (mu/mu_I, lambda)-CMA-ES Nikolaus Hansen and Andreas Ostermeier ABSTRACT: The intermediate (center of mass) recombination of object parameters is introduced in the evolution strategy with derandomized covariance matrix adaptation (CMA-ES). On various (unimodal) real space fitness functions convergence properties and robustness against distorted selection are tested for different parent numbers. Introducing (mu/mu_I,lambda)-selection significantly improves robustness and has comparatively minor influence on the convergence speed of the CMA-ES. In: EUFIT'97, 5th Europ. Congr. on Intelligent Techniques and Soft Computing, Proceedings:650--654.