说明：  机器学习笔记1，此电子文档涵盖了机器学习中各种概念，讲解详细，清楚，到位，深入浅出，易于理解，是机器学习中比较好的一本从开始学习到深入理解机器学习的资料。
(Machine learning notes 1, this electronic document covers various concepts in machine learning, explain in detail, clear, in place, easy to understand, easy to understand, is a better material in machine learning from the beginning of learning to a deep understanding of machine learning.)