最近邻算法的构建，构造kd-tree。是统计学习方法中的经典方法。是其源码实现。-Nearest neighbor algorithm, constructed kd-tree. The classical method is a statistical learning method. Its source code to achieve.

KD-Tree的c++实现，并有文档详细介绍了KD-Tree的实现算法。-KD-Tree of c++ implementation, detailing the implementation of the KD-Tree algorithm.