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