说明：  半监督判别分析（SSDR），是南京大学数据挖掘研究所提出的一种新的半监督降维算法，对于数据挖掘和类别样本的获取有着十分重要的借鉴价值。
(A semi-supervised discriminant analysis (SSDR), is one of the types of data mining research institute of nanjing university puts forward new a semi-supervised dimensionality reduction algorithm, for data mining and the category of sample has very important reference value.)