Keyphrases
- question answering
- natural language processing
- qa clef
- information retrieval
- natural language
- visual information
- cross language
- passage retrieval
- information extraction
- named entities
- question answering systems
- question classification
- syntactic information
- sentence retrieval
- visual features
- semantic roles
- natural language questions
- answer validation
- open domain question answering
- data mining
- low level
- qa systems
- keywords