中文说明：
包括指数、对数、幂指数、双曲线、Logistic、多项式、Gamma等模型的非线性拟合，每行代码均有中文注释便于理解。
English Description：
Including exponential, logarithmic, power exponential, hyperbolic, logistic, polynomial, gamma model of nonlinear fitting, each line of code has Chinese comments, easy to understand.