Keyphrases
- question answering
- question classification
- natural language questions
- question answering systems
- answering questions
- answer validation
- candidate answers
- qa systems
- knowledge base
- information extraction
- information retrieval
- answer extraction
- natural language processing
- qa clef
- natural language
- knowledge representation
- open domain question answering
- cross language
- named entities
- sentence retrieval
- domain knowledge
- textual entailment
- syntactic information
- semantic roles
- passage retrieval
- question answer pairs
- knowledge sources