说明：  这本书介绍了20多个使用Python编码的深度神经网络，使用Keras，一个模块化的神经网络库，运行在谷歌的TensorFlow或Lisa Lab的Theano后端之上。
(The book presents more than 20 working deep neural networks coded in Python using Keras, a modular neural network library that runs on top of either Google's TensorFlow or Lisa Lab's Theano backends.)