Keyphrases
- retrieval model
- document retrieval
- information retrieval systems
- retrieval systems
- vector space model
- term frequency
- tf idf
- information retrieval
- test collection
- language modeling
- language model
- query terms
- document type
- improvements in retrieval effectiveness
- retrieval effectiveness
- user queries
- text retrieval
- effective retrieval
- relevant documents
- passage retrieval
- document collections
- query expansion
- retrieval process
- retrieval framework
- vector space
- relevance feedback
- retrieved documents
- probabilistic retrieval models
- document ranking
- language modeling framework
- sentence retrieval
- keywords
- average precision
- ranked list
- n gram
- question answering
- term weighting
- principal component analysis
- data points
- query processing
- trec collections
- feature extraction
- multimedia