Keyphrases
- question answering
- relation extraction
- information extraction
- natural language processing
- named entities
- information retrieval
- natural language
- natural language questions
- question classification
- cross language
- syntactic information
- passage retrieval
- qa clef
- candidate answers
- answer validation
- open domain question answering
- semantic roles
- data mining
- probabilistic model
- sentence retrieval
- artificial intelligence
- textual entailment recognition