Keyphrases
- question answering
- knowledge base
- natural language processing
- information extraction
- question classification
- information retrieval
- natural language questions
- question answering systems
- passage retrieval
- expert systems
- qa clef
- natural language
- relation extraction
- cross language
- qa systems
- domain knowledge
- open domain question answering
- machine learning
- named entities
- logic programming
- sentence retrieval
- answering questions
- answer validation
- semantic roles
- syntactic information
- artificial intelligence