Keyphrases
- document collections
- question answering
- information retrieval
- cross language
- document retrieval
- information retrieval systems
- test collection
- passage retrieval
- text retrieval
- relevant documents
- digital libraries
- natural language processing
- information extraction
- document clustering
- cl sr
- natural language
- query expansion
- qa clef
- language model
- speech transcripts
- named entities
- machine learning
- relational databases
- spoken document retrieval