neural network and deep learning

在线书籍http://neuralnetworksanddeeplearning.com/chap2.html

The four fundamental equations的证明及第二章习题解答

https://blog.csdn.net/AFUL1991/article/details/79599213

手写识别数字代码详解

https://blog.csdn.net/dugudaibo/article/details/77119534

https://www.cnblogs.com/pathrough/p/5855084.html

习题一解答

https://blog.csdn.net/weixin_34319111/article/details/92180824

原文：https://www.cnblogs.com/wwqdata/p/12409615.html