Keyphrases
- information retrieval
- test collection
- question answering
- retrieval effectiveness
- pseudo relevance feedback
- relevance feedback
- database
- blog opinion retrieval
- ad hoc retrieval
- information retrieval systems
- trec web
- query expansion
- active learning
- case study
- language model
- image retrieval
- database systems
- clustering algorithm
- website
- social networks
- okapi bm
- neural network
- trec blog track
- databases