1 sotfmax 函数:
stanford UFLDL:
http://deeplearning.stanford.edu/wiki/index.php/Softmax%E5%9B%9E%E5%BD%92
softmax 损失函数 求导:
https://blog.csdn.net/qian99/article/details/78046329
2 feedforward neural networks
backpropagation algorithm:
https://www.cnblogs.com/charlotte77/p/5629865.html
转载于:https://www.cnblogs.com/pertinencec/p/9635916.html
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