Keyphrases
- document retrieval
- pseudo relevance feedback
- information retrieval
- expert search
- relevance feedback
- test collection
- document collections
- relevant documents
- language model
- retrieval model
- retrieval effectiveness
- question answering systems
- ad hoc retrieval
- question answering
- text retrieval
- retrieved documents
- ranking functions
- learning to rank
- document indexing
- relevance judgments
- document level
- query terms
- query expansion
- cross language
- user feedback
- spreading activation
- document ranking
- information retrieval systems
- xml retrieval
- relevance model
- retrieval strategies
- passage retrieval
- information extraction
- image retrieval