Keyphrases
- question answering
- question classification
- natural language questions
- question answering systems
- answer validation
- answering questions
- knowledge base
- natural language
- qa systems
- candidate answers
- answer extraction
- named entities
- information retrieval
- open domain question answering
- qa clef
- natural language processing
- knowledge representation
- domain knowledge
- passage retrieval
- syntactic information
- question answer pairs
- information extraction
- cross language
- relational databases
- expert systems
- textual entailment recognition
- machine learning
- feature weighting
- language model