Keyphrases
- nonnegative matrix factorization
- probabilistic latent semantic indexing
- matrix factorization
- negative matrix factorization
- data representation
- least squares
- nonnegative matrix
- active set
- bayesian networks
- spectral clustering
- prior knowledge
- principal component analysis
- maximum likelihood
- original data
- sparsity constraints
- objective function
- information retrieval
- data sets
- document clustering
- factor matrices
- data mining