所有配图来自下面这个网址
7. Modern Convolutional Neural Networks - Dive into Deep Learning 0.14.4 documentation
引领进入深层神经网络
Dropout,ReLU的有效应用
$$ \mathbf{x} \rightarrow\left[\mathbf{x}, f_{1}(\mathbf{x}), f_{2}\left(\left[\mathbf{x}, f_{1}(\mathbf{x})\right]\right), f_{3}\left(\left[\mathbf{x}, f_{1}(\mathbf{x}), f_{2}\left(\left[\mathbf{x}, f_{1}(\mathbf{x})\right]\right)\right]\right), \ldots\right] $$