Keyphrases
- question answering
- question answering systems
- question classification
- qa clef
- answer extraction
- natural language questions
- answering questions
- qa systems
- answer validation
- candidate answers
- open domain question answering
- information extraction
- information retrieval
- natural language processing
- natural language
- cross language
- passage retrieval
- named entities
- question answer pairs
- semantic roles
- feature weighting
- document retrieval
- information retrieval systems
- search engine
- data mining