Keyphrases
- retrieval model
- document retrieval
- language model
- language modeling
- retrieval effectiveness
- test collection
- vector space
- information retrieval systems
- information retrieval
- text retrieval
- vector space model
- query expansion
- tf idf
- retrieval systems
- natural language processing
- query terms
- user queries
- natural language
- retrieval framework
- statistical language models
- relevance feedback
- effective retrieval
- document collections
- relevant documents
- n gram
- probabilistic model
- retrieval process
- passage retrieval
- data sets
- trec collections
- sentence retrieval
- database