利用 t-SNE 高维数据的可视化 

　　具体软件和教程见： http://lvdmaaten.github.io/tsne/

 　  简要介绍下用法：

　　% Load data
　　load ’mnist_train.mat’
　　ind = randperm(size(train_X, 1));
　　train_X = train_X(ind(1:5000),:);
　　train_labels = train_labels(ind(1:5000));
　　% Set parameters
　　no_dims = 2;
　　initial_dims = 50;
　　perplexity = 30;

　　% Run t????SNE
　　mappedX = tsne(train_X, [], no_dims, initial_dims, perplexity);
　　% Plot results
　　gscatter(mappedX(:,1), mappedX(:,2), train_labels);

　　示意结果截图：