Keyphrases
- test collection
- patent retrieval
- evaluation metrics
- cross language information retrieval
- ir evaluation
- web retrieval
- trec web
- evaluation framework
- average precision
- retrieval effectiveness
- information retrieval
- cross lingual information retrieval
- english chinese
- data sets
- query expansion
- language model
- artificial neural networks
- search tasks
- expert systems
- digital libraries
- natural language
- graded relevance