Keyphrases
- question answering systems
- question answering
- test collection
- question classification
- natural language
- information retrieval
- web retrieval
- patent retrieval
- document retrieval
- evaluation metrics
- cross language information retrieval
- retrieval model
- open domain
- relevant documents
- cross lingual information retrieval
- document collections
- retrieval effectiveness
- cross language
- trec web
- average precision
- information extraction
- natural language processing
- information retrieval systems
- passage retrieval
- query translation
- search tasks
- answer extraction
- search engine
- ir evaluation
- answer validation
- evaluation methodology
- evaluation framework
- learning to rank
- cross lingual
- similarity measure
- english chinese
- artificial intelligence