https://www.jianshu.com/p/87057397a070
https://blog.youkuaiyun.com/v_july_v/article/details/40738211
https://blog.youkuaiyun.com/yujianmin1990/article/details/48420483
https://www.cnblogs.com/xbinworld/archive/2012/11/29/2795287.html
http://web.cse.ohio-state.edu/~belkin.8/papers/LEM_NIPS_01.pdf
1.拉普拉斯矩阵(Laplacian Matrix)
- 表示图的一种矩阵,给定n个顶点的图 G=(V,E) G = ( V , E ) ,分别表示graph、vertex、edge
- Laplacian Matrix定义为,D为度矩阵,W为邻接矩阵
L=D−W L = D − W
例子:
则邻接矩阵W为
W=⎡⎣⎢⎢⎢⎢⎢⎢⎢010010101010010100001011110100000100⎤⎦⎥⎥⎥⎥⎥⎥⎥ W = [ 0 1 0 0 1 0 1 0 1 0 1 0 0 1 0 1 0 0 0 0 1 0 1 1 1 1 0 1 0 0 0 0 0 1 0 0 ]
度矩阵D为
D=⎡⎣⎢⎢⎢⎢⎢⎢⎢20