Physarum-Based Ant Colony Optimization for Graph Coloring Problem.

Graph coloring problem (GCP) is a classical combinatorial optimization problem and has many applications in the industry. Many algorithms have been proposed for solving GCP. However, insufficient efficiency and unreliable stability still limit their performance. Aiming to overcome these shortcomings, a physarum-based ant colony optimization for solving GCP is proposed in this paper. The proposed algorithm takes advantage of the positive feedback mechanism of the physarum mathematical model to optimize the pheromone matrix updating in the ant colony optimization. Some experiments are implemented to estimate the efficiency and stability of the proposed algorithm compared with typical ant colony optimization and some state-of-art algorithms. According to these results, in terms of the efficiency, stability and computational cost, we can daringly infer that the improved ant colony optimization with the physarum model performs better than the aforementioned for graph coloring. In particular, it is recommended that the model is of rationality and the proposed algorithm is of validity, which will foster a science of color number and computational cost in GCP.