Feature Selection
For the data file (data.txt), each row is a data point and each column is a feature. For the label file (y.txt), there are two cases. For binary data, there is one column in y, positive class 1 and negative class 0. For multiclass data, the number of columns in y is the same as the number of classes; if a data i is in class j then there is 1 in row i and column j, otherwise 0.
Clustering
Dimensionality Reduction