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, Independent component analysis algorithm reduces the raw data noise.