说明：  PSO算法就是模拟一群鸟寻找食物的过程，每个鸟就是PSO中的粒子，也就是我们需要求解问题的可能解，这些鸟在寻找食物的过程中，不停改变自己在空中飞行的位置与速度。
(PSO algorithm is to simulate a flock of birds looking for food in the process, each bird is the PSO particles, that is, we need to solve the problem of possible solutions, and these birds in the process of looking for food, constantly change their position and velocity in the air.)