标签：ica error mat gradient str sub cal 求导 --
There are two ways to compute the gradient: A slow, approximate but easy way (numerical gradient), and a fast, exact but more error-prone way that requires calculus (analytic gradient). We will now present both.
analytic gradient： 这里是指用subgradient近似后，不用再求导了。详见原文。
标签：ica error mat gradient str sub cal 求导 --
原文地址：http://www.cnblogs.com/kprac/p/6537295.html
