Keyphrases
- test collection
- web retrieval
- evaluation metrics
- patent retrieval
- cross language information retrieval
- trec web
- ir evaluation
- evaluation framework
- english chinese
- information extraction
- retrieval effectiveness
- learning to rank
- average precision
- precision and recall
- search engine
- data mining
- bi directional
- relevant documents
- query expansion
- language model
- active learning
- information retrieval evaluation
- information retrieval