[Machine_Learning]--Backpropagation

这里只提供一些关于反向传播（Backpropagation）链接资源, this is part of the neural network. And neural network is basis of deep learning.
1. Mathematic Basics of the backpropagation. http://my.oschina.net/findbill/blog/529001
2. Total walk_through of neural network about the coursera’s of Andrew. Ng