Keyphrases
- question answering
- information retrieval
- natural language
- natural language processing
- question classification
- information extraction
- question answering systems
- passage retrieval
- sentence retrieval
- relation extraction
- open domain question answering
- natural language questions
- cross language
- named entities
- syntactic information
- qa systems
- answer extraction
- qa clef
- test collection
- candidate answers
- search engine
- artificial intelligence