Keyphrases
- information retrieval
- information retrieval systems
- document corpus
- information extraction
- language modeling
- text processing
- artificial intelligence
- search engine
- manually annotated
- text collections
- information access
- test collection
- retrieval effectiveness
- data sets
- specific domains
- term weighting
- learning to rank
- document retrieval
- document collections
- query expansion
- text mining
- knowledge discovery
- computer science
- question answering
- language processing
- natural language processing
- open domain
- topic detection and tracking
- natural language