寻找函数的全局极小值，global minimization of contrast function with random restarts the data are assumed whitened (i.e. with identity covariance matrix). The output is such that Wopt*x are the independent sources.-Find function of the minimum value of the overall situation, global minimization of contrast function with random restarts the data are assumed whitened ( Covariance ie with identity matrix). The out put is such that Wopt * x are the independent sour ces.