D-Tree是在机器学习的领域中一项非常重要的概念，D-Tree可以将大幅度地提高以前数的结构的效率。上传的文件中实现了一个最基本的D-Tree，并带有三个样例。-D-Tree is in the field of machine learning a very important concept, D-Tree can be significantly improved before the structure of a number of efficiency. From the paper