Keyphrases
- retrieval model
- language modeling
- information retrieval systems
- language model
- test collection
- document retrieval
- retrieval effectiveness
- text retrieval
- vector space
- vector space model
- information retrieval
- retrieval systems
- query expansion
- user queries
- retrieval framework
- statistical language models
- relevance feedback
- tf idf
- retrieval process
- passage retrieval
- sentence retrieval
- improvements in retrieval effectiveness
- search engine
- effective retrieval
- natural language
- feature extraction
- database