Keyphrases
- question answering
- natural language processing
- information extraction
- information retrieval
- question classification
- cross language
- question answering systems
- passage retrieval
- named entities
- syntactic information
- computational linguistics
- natural language questions
- qa clef
- machine learning
- training set
- qa systems
- natural language
- sentence retrieval
- answer validation
- open domain question answering
- relation extraction
- answer extraction