拉普拉斯降维方法，是非线性数据降维方法，通过构建相似关系图来重构数据局部流形结构特征。-Laplace dimension reduction method is non-linear data dimensionality reduction method, by constructing a graph similar to reconstruct the structure of local manifoldof the data.

掌握图的邻接矩阵的存储结构；实现图的两种遍历：深度优先遍历和广度优先遍历,()