Keyphrases
- relevant documents
- test collection
- information retrieval systems
- information retrieval
- retrieval effectiveness
- document collections
- document retrieval
- user queries
- query expansion
- relevance feedback
- retrieved documents
- keywords
- result set
- query terms
- relevance judgments
- pseudo relevance feedback
- user feedback
- highly relevant
- document set
- federated search
- score distributions
- search queries
- vector space model
- information extraction
- search engine
- database
- language model
- probabilistic model
- multiple interpretations
- trec ad hoc