Keyphrases
- test collection
- information retrieval
- retrieval effectiveness
- question answering
- relevance feedback
- pseudo relevance feedback
- blog opinion retrieval
- information systems
- reuters corpus volume
- trec web
- evaluation campaigns
- ad hoc retrieval
- language model
- trec blog track
- retrieval systems
- data fusion
- document level
- ir evaluation
- information retrieval systems
- okapi bm
- co occurrence
- active learning
- digital libraries