Keyphrases
- nonnegative matrix factorization
- sparsity constraints
- negative matrix factorization
- probabilistic latent semantic indexing
- matrix factorization
- data representation
- active set
- low rank approximation
- sparse representation
- least squares
- spectral clustering
- nonnegative matrix
- original data
- objective function
- document clustering
- data matrix
- high dimensional
- dictionary learning
- principal component analysis
- multiscale
- sparse coding
- unsupervised learning