该函数用来计算任意函数的一阶偏导数(数值方法),利用最小二乘法进行拟合多元非线性方程，独立成分分析算法降低原始数据噪声。- This function is used to calculate the arbitrary function of the first order partial derivative (numerical methods), Multivariate least squares fitting method of nonlinear equations, Indep