Keyphrases
- web pages
- information retrieval
- test collection
- social networks
- question answering
- social media
- pseudo relevance feedback
- microblog posts
- retrieval effectiveness
- clef ip
- relevance feedback
- neural network
- retrieval model
- real time tracking
- information propagation
- ir evaluation
- biomedical information retrieval
- learning algorithm
- trec blog track
- blog opinion retrieval