Keyphrases
- information retrieval
- test collection
- image database
- ad hoc retrieval
- relevance feedback
- multimedia databases
- retrieval model
- trec ad hoc
- retrieval effectiveness
- information retrieval systems
- image retrieval
- question answering
- query expansion
- text retrieval
- language model
- retrieval method
- relevance judgments
- retrieval accuracy
- probabilistic model
- clef ip
- probabilistic retrieval model