Abstract
Several papers in the scientific literature use metaheuristics to solve continuous global optimization. To perform this task, some metaheuristics originally proposed for solving combinatorial optimization problems, such as Greedy Randomized Adaptive Search Procedure (GRASP), Tabu Search and Simulated Annealing, among others, have been adapted to solve continuous global optimization problems. Proposed by Hirsch et al., the Continuous-GRASP (C-GRASP) is one example of this group of metaheuristics. The C-GRASP is an adaptation of GRASP proposed to solve continuous global optimization problems under box constraints. It is simple to implement, derivative-free and widely applicable method. However, according to Hedar, due to its random construction, C-GRASP may fail to detect promising search directions especially in the vicinity of minima, which may result in a slow convergence. To minimize this problem, in this paper we propose a set of methods to direct the search on C-GRASP, called Directed Continuous-GRASP (DC-GRASP). The proposal is to combine the ability of C-GRASP to diversify the search over the space with some efficient local search strategies to accelerate its convergence. We compare the DC-GRASP with the C-GRASP and other metaheuristics from literature on a set of standard test problems whose global minima are known. Computational results show the effectiveness and efficiency of the proposed methods, as well as their ability to accelerate the convergence of the C-GRASP.
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Notes
We also tried to compare with New C-GRASP solution, but our implementation of New C-GRASP did not reproduce the results presented in the Hirsch et al. work (Hirsch et al. 2010). For some functions, we did not even found a solution.
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de Araújo, T.M.U., Andrade, L.M.M.S., Magno, C. et al. DC-GRASP: directing the search on continuous-GRASP. J Heuristics 22, 365–382 (2016). https://doi.org/10.1007/s10732-014-9278-6
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DOI: https://doi.org/10.1007/s10732-014-9278-6