Keyphrases
- information retrieval
- topic detection and tracking
- test collection
- clef ip
- news articles
- news stories
- keywords
- social media
- biomedical information retrieval
- expert search
- question answering
- relevance feedback
- retrieval effectiveness
- ad hoc retrieval
- cross media
- query expansion
- information retrieval systems
- topic detection
- question answering systems
- news items
- search engine
- machine learning
- neural network