Keyphrases
- information retrieval
- test collection
- question answering
- retrieval effectiveness
- data sets
- biomedical information retrieval
- pseudo relevance feedback
- ad hoc retrieval
- query performance prediction
- information extraction
- relevance feedback
- natural language
- multimedia
- artificial intelligence
- genetic algorithm
- future trends
- question answering systems
- okapi bm
- database
- reuters corpus volume