Keyphrases
- nonnegative matrix factorization
- probabilistic latent semantic indexing
- negative matrix factorization
- matrix factorization
- data representation
- least squares
- principal component analysis
- active set
- spectral clustering
- nonnegative matrix
- original data
- document clustering
- sparsity constraints
- objective function
- efficient implementation
- image sequences
- data clustering
- signal processing
- data analysis