Keyphrases
- nonnegative matrix factorization
- probabilistic latent semantic indexing
- negative matrix factorization
- matrix factorization
- active set
- data representation
- principal component analysis
- least squares
- nonnegative matrix
- spectral clustering
- original data
- factor matrices
- feature space
- sparsity constraints
- image segmentation
- document clustering
- collaborative filtering
- knn
- objective function