gatsby2016 / coding4bioinfo Goto Github PK
View Code? Open in Web Editor NEWcoding test for bioinfo.
coding test for bioinfo.
Isomap, LLE, spectral embedding, tSNE, UMAP
由LLE到laplacian eigenmap 到spectral cluster;
laplacian eigenmap
拉普拉斯矩阵(Laplace Matrix)与瑞利熵(Rayleigh quotient)
谱聚类
关于距离度量【euclidean, pearson, spearman】的三种策略:
NOTE: 其他什么街区距离 余弦相似度等,都还是以上几种的不同延伸变种,本质设计理念和计算方式一致。
what is kernel function?
details about kernel function
kernel function in ML
Mercer 定理:任何半正定的函数都可以作为核函数。所谓半正定的函数f(xi,xj),是指拥有训练数据集合(x1,x2,...xn),我们定义一个矩阵的元素aij = f(xi,xj),这个矩阵式n*n的,如果这个矩阵是半正定的,那么f(xi,xj)就称为半正定的函数。
请注意,这个mercer定理不是核函数必要条件,只是一个充分条件,即还有不满足mercer定理的函数也可以是核函数。所谓半正定指的就是核矩阵K的特征值均为非负。
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