Keyphrases
- question answering
- information retrieval
- natural language
- natural language processing
- passage retrieval
- question answering systems
- information extraction
- named entities
- cross language
- question classification
- qa clef
- natural language questions
- syntactic information
- relation extraction
- candidate answers
- answering questions
- textual entailment recognition
- open domain question answering
- machine learning
- answer validation