Keyphrases
- test collection
- information retrieval
- search tasks
- retrieval effectiveness
- question answering
- pseudo relevance feedback
- ad hoc retrieval
- trec web
- real world
- machine learning
- ir evaluation
- relevance judgements
- relevance judgments
- average precision
- blog opinion retrieval
- trec blog track
- expert search
- data sets
- web search
- bayesian networks
- artificial intelligence
- neural network