Keyphrases
- times faster
- preprocessing
- experimental evaluation
- worst case
- improved algorithm
- np hard
- objective function
- theoretical analysis
- expectation maximization
- detection algorithm
- cost function
- learning algorithm
- recognition algorithm
- matching algorithm
- clustering method
- particle swarm optimization
- computational cost
- k means
- computational complexity
- optimal solution
- simulated annealing
- face recognition
- stochastic gradient
- independent components
- negative matrix factorization
- subspace clustering
- neural network
- feature selection
- convergence rate
- independent component analysis
- tree structure
- probabilistic model
- dimensionality reduction