Keyphrases
- question answering
- open source
- question classification
- information extraction
- natural language processing
- information retrieval
- natural language
- named entities
- cross language
- question answering systems
- syntactic information
- relation extraction
- passage retrieval
- qa clef
- case study
- natural language questions
- textual entailment recognition
- open domain question answering
- answering questions
- answer validation
- query expansion
- document retrieval
- machine learning