中文说明：粒子群算法很好的案例，各种典型无约束函数的极值寻优；Griewank函数、Rastrigrin函数、Schaffer函数、Ackley函数、Rosenbrock函数等，以及有约束的目标函数求最优值
English Description：
Particle Swarm Optimization algorithm good case, typical of unconstrained function extremum search; Griewank function, the Rastrigrin function, Schaffer function, Ackley and Rosenbrock function, as well as the constraints of objective function optimal value