Keyphrases
- retrieval effectiveness
- test collection
- information retrieval systems
- document retrieval
- information retrieval
- pseudo relevance feedback
- query expansion
- retrieval model
- question answering
- average precision
- expert search
- relevance feedback
- document collections
- ad hoc retrieval
- language model
- latent semantic indexing
- relevance judgments
- blog opinion retrieval
- question answering systems
- biomedical information retrieval
- data sets
- tf idf
- active learning
- ir evaluation
- reuters corpus volume
- machine learning
- query terms
- relevant documents
- web search
- weighting schemes
- topic detection and tracking
- search engine
- trec web
- trec blog track