Keyphrases
- question answering
- information retrieval
- natural language processing
- natural language
- question classification
- information extraction
- syntactic information
- qa clef
- multi modal
- visual features
- named entities
- visual information
- question answering systems
- natural language questions
- passage retrieval
- cross language
- low level
- sentence retrieval
- relation extraction
- answering questions
- machine learning
- qa systems
- co occurrence
- multimedia
- answer validation
- open domain question answering