Keyphrases
- question answering
- natural language processing
- syntactic information
- textual entailment recognition
- question classification
- natural language
- information extraction
- semantic roles
- information retrieval
- qa clef
- cross language
- open domain question answering
- passage retrieval
- natural language questions
- question answering systems
- named entities
- sentence retrieval
- answer validation
- machine learning
- low dimensional
- information retrieval systems
- text summarization
- answer extraction
- keywords