练习：Padding 填充

在卷积神经网络中实施填充是一件十分重要的事情，如果没有填充，边缘区域的像素值基本不会受到卷积层的影响。

那么，如何写填充代码：

# if you want to pad the array "a" of shape  (5,5,5,5,5)(5,5,5,5,5)  with pad = 1 for the 2nd dimension, 
# pad = 3 for the 4th dimension and pad = 0 for the rest, you would do

a = np.pad(a, ((0,0), (1,1), (0,0), (3,3), (0,0)), 'constant', constant_values = (..,..))

具体详细讲解，可见：http://www.bubuko.com/infodetail-2448104.html