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