Keyphrases
- norm minimization
- convex optimization
- principal component analysis
- sparse representation
- matrix completion
- unsupervised feature selection
- dimensionality reduction
- interior point methods
- principal components
- sparse coding
- face images
- face recognition
- negative matrix factorization
- feature extraction
- feature space
- high dimensional
- singular value decomposition
- image classification
- nearest neighbor
- low rank
- convex relaxation
- data sets