Journal
IEEE TRANSACTIONS ON EVOLUTIONARY COMPUTATION
Volume 26, Issue 2, Pages 379-391Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEVC.2021.3089155
Keywords
Statistics; Sociology; Optimization; Evolutionary computation; Uninterruptible power systems; Search problems; Constraint handling; Constraint handling; evolutionary algorithm; indicator; multiobjective optimization
Funding
- Natural Science Foundation of Guangdong Province [2020A1515011500, 2019B1515120036, 501200069]
- Programme of Science and Technology of Guangdong Province [2020A0505100056]
- National Natural Science Foundation of China [61773127]
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To prevent the population from getting stuck in local areas and missing the constrained Pareto front fragments in constrained multiobjective optimization problems (CMOPs), this paper proposes a new constraint handling technique (CHT) based on an indicator. The CHT divides the promising areas into multiple subregions and prioritizes the removal of individuals with the worst fitness values in the densest subregions, improving the diversity of the population in the promising areas. Numerical experiments demonstrate the effectiveness of the proposed algorithm in handling different types of CMOPs, especially in problems where individuals easily appear in local infeasible areas dominating the constrained Pareto front fragments.
To prevent the population from getting stuck in local areas and then missing the constrained Pareto front fragments in dealing with constrained multiobjective optimization problems (CMOPs), it is important to guide the population to evenly explore the promising areas that are not dominated by all examined feasible solutions. To this end, we first introduce a cost value-based distance into the objective space, and then use this distance and the constraints to define an indicator to evaluate the contribution of each individual to exploring the promising areas. Theoretical studies show that the proposed indicator can effectively guide population to focus on exploring the promising areas without crowding in local areas. Accordingly, we propose a new constraint handling technique (CHT) based on this indicator. To further improve the diversity of population in the promising areas, the proposed indicator-based CHT divides the promising areas into multiple subregions, and then gives priority to removing the individuals with the worst fitness values in the densest subregions. We embed the indicator-based CHT in evolutionary algorithm and propose an indicator-based constrained multiobjective algorithm for solving CMOPs. Numerical experiments on several benchmark suites show the effectiveness of the proposed algorithm. Compared with six state-of-the-art constrained evolutionary multiobjective optimization algorithms, the proposed algorithm performs better in dealing with different types of CMOPs, especially in those problems that the individuals are easy to appear in the local infeasible areas that dominate the constrained Pareto front fragments.
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