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代码说明：

  人口迁移算法，此程序实现人口迁移算法，用于求解无约束连续函数最小化问题。对于最大化问题，请先将其加负号转化为最小化问题(Population migration algorithm to achieve this process migration algorithm for solving unconstrained minimization problem of continuous functions. For the maximization problem, please add them into a minus sign to minimize the problem)