符号表示
1. 一层神经网络
逻辑回归实际就是一层神经网络
根据链式法则:
2. 两层神经网络
(1)Forward Propagation
Input Layer
Hidden Layer
令
则
Output Layer
(2) Borward Propagation
3. 三层神经网络
3_Layers_NN : LINEAR -> RELU -> LINEAR -> RELU -> LINEAR -> SIGMOID
(1) Forward Propatation
(2) Borward Propatation
Layer 3:
Layer 2:
Layer 1:
4. L_Layers_NN
L_Layers_NN : [LINEAR -> RELU] × \times× (L-1) -> LINEAR -> SIGMOID
For layer l ( l = 1 , 2... , L )
Forward Propatation And Backward Propagation