Keyphrases
- question answering
- syntactic information
- natural language
- sentence retrieval
- text summarization
- semantic roles
- natural language processing
- information retrieval
- information extraction
- passage retrieval
- cross language
- relation extraction
- question answering systems
- part of speech
- qa clef
- open domain question answering
- question classification
- named entities
- vector space
- qa systems
- linguistic features
- answer extraction
- semantic parsing
- answering questions
- natural language questions
- answer validation
- data mining
- semantic role labeling
- n gram
- textual entailment recognition
- retrieval model