Keyphrases
- matrix factorization
- lower bound
- upper bound
- collaborative filtering
- recommender systems
- missing data
- low rank
- negative matrix factorization
- nonnegative matrix factorization
- worst case
- factor analysis
- objective function
- factorization methods
- data sparsity
- variational bayesian
- stochastic gradient descent
- factorization method
- optimal solution
- item recommendation
- implicit feedback
- supervised learning