深度学习是机器学习的一个分支，它能够使计算机通过层次概念来学习经验和理解世界。因为计算机能够从经验中获取知识，所以不需要人类来形式化地定义计算机需要的所有知识。层次概念允许计算机通过构造简单的概念来学习复杂的概念，而这些分层的图结构将具有很深的层次。本书会介绍深度学习领域的许多主题。(Deep learning is a branch of machine learning. It enables computers to learn experience and understand the world through hierarchical concepts. Because computers can acquire knowledge from experience, it is not necessary for humans to formally define all knowledge that computers need. The concept of hierarchy allows computers to learn complex concepts by constructing simple concepts, and these hierarchical graph structures will have a deep level. This book will introduce a lot of topics in the field of deep learning.)