Keyphrases
- information retrieval
- test collection
- question answering
- retrieval effectiveness
- pseudo relevance feedback
- relevance feedback
- evaluation campaigns
- relevance judgments
- expert search
- ad hoc retrieval
- relevant documents
- data sets
- query expansion
- question answering systems
- information retrieval systems
- topic detection and tracking
- co occurrence
- biomedical information retrieval
- trec web
- reuters corpus volume
- trec blog track
- blog opinion retrieval