Keyphrases
- generative model
- probabilistic model
- mixture model
- discriminative models
- discriminative learning
- hierarchical hidden markov models
- information retrieval
- topic models
- maximum entropy principle
- prior knowledge
- conditional random fields
- information retrieval systems
- document retrieval
- image retrieval
- generative and discriminative models
- latent dirichlet allocation
- semi supervised
- test collection
- retrieval systems
- language model
- retrieval model
- relevance feedback
- em algorithm
- object categories
- information extraction
- query expansion
- representational power
- expectation maximization