Keyphrases
- test collection
- average precision
- information retrieval
- information retrieval systems
- retrieval effectiveness
- document collections
- question answering
- pseudo relevance feedback
- expert search
- structured queries
- biomedical information retrieval
- relevance judgments
- ad hoc retrieval
- relevance feedback
- trec web
- trec blog track
- question answering systems
- data sets
- evaluation campaigns
- reuters corpus volume
- blog opinion retrieval
- query expansion
- language model
- natural language processing
- databases