牛顿法、随机梯度下降法、拟牛顿法、BFGS
http://nooverfit.com/wp/12-%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0%E8%83%BD%E5%8A%9B%E8%87%AA%E6%B5%8B%E9%A2%98-%E7%9C%8B%E7%9C%8B%E4%BD%A0%E7%9A%84%E6%9C%BA%E5%99%A8%E5%AD%A6%E4%B9%A0%E7%9F%A5%E8%AF%86%E8%83%BD%E6%89%93/
原文:http://www.cnblogs.com/bigjelly/p/7609899.html