中文说明：该算法包含极大似然估计的梯度算法和快速ica算法，已经调试成功过，调试时注意所给信号x是行向量还是列向量
English Description：
The algorithm includes gradient algorithm of maximum likelihood estimation and fast ICA algorithm, which has been debugged successfully. When debugging, pay attention to whether the given signal x is a row vector or a column vector