Keyphrases
- question answering
- passage retrieval
- information retrieval
- information extraction
- question answering systems
- natural language processing
- question classification
- cross language
- document retrieval
- sentence retrieval
- qa clef
- syntactic information
- answer extraction
- automatic extraction
- natural language
- named entities
- retrieval systems
- retrieval model
- image retrieval
- query expansion
- information retrieval systems
- speech transcripts
- machine translation
- natural language questions
- text retrieval
- test collection
- text mining
- relevance feedback
- data retrieval
- evaluation methods
- text documents
- answering questions
- artificial intelligence