Keyphrases
- question answering
- candidate answers
- semantic models
- question answering systems
- question classification
- natural language questions
- qa systems
- information retrieval
- answering questions
- semantic features
- answer validation
- named entities
- correct answers
- information extraction
- natural language processing
- answer extraction
- ranked list
- natural language
- passage retrieval
- qa clef
- text summarization
- web search
- low level
- question answer pairs