Keyphrases
- query expansion
- retrieval effectiveness
- pseudo relevance feedback
- biomedical information retrieval
- information retrieval
- relevance feedback
- document level
- information retrieval systems
- ad hoc retrieval
- language modeling
- interactive query expansion
- language model
- relevant documents
- improving search
- expert search
- topic models
- question answering
- learning process
- image retrieval
- learning algorithm