A Flexible Ranking-Based Competitive Swarm Optimizer for Large-Scale Continuous Multiobjective Optimization

Due to the curse of dimensionality, the search efficiency of existing operators in large-scale decision space deteriorates dramatically. The competitive swarm optimizer (CSO)-based framework has great potential in tackling large-scale single-objective optimization problems. However, the existing CSOs only focus on the loser to winner learning paradigm and neglect the significance of the winner determination mechanism for large-scale search, which makes the algorithm difficult to escape from local optima. To remedy this issue, a flexible ranking-based CSO has been tailored for handling large-scale multiobjective optimization problems (MOPs). Concretely, a novel winner determination strategy is introduced to broadly identify high-quality individuals in the population to enhance diversity maintenance. In addition, a special competitive mechanism is adopted to guide the search direction, which is capable of efficiently increasing search space utilization. The simulation results validate that the proposed algorithm can significantly enhance the exploration and exploitation ability of the conventional CSO, and outperforms several state-of-the-art large-scale multiobjective optimization algorithms on both large-scale benchmark MOPs and application examples.