该书理论和实践相结合，介绍了当前深度学习应用的几个主要框架和应用方向，实用性强，内容紧凑。基于Keras这个高度抽象的深度学习环境，全书强调快速构造深度学习模型和应用于实际业务，因此特别适合深度学习实践者和入门者学习，是一本必不可少的参考书。(The book combines theory and practice to introduce several main fr a meworks and application directions of current deep learning applications, with strong practicability and compact content. Based on the highly abstract deep learning environment of Keras, the book emphasizes the rapid construction of deep learning models and application in actual business, so it is especially suitable for deep learning practitioners and beginners to learn, and it is an indispensable reference book.)