Keyphrases
- expansion terms
- query expansion
- selection criteria
- pseudo relevance feedback
- original query
- data sources
- relevant documents
- automatic query expansion
- term selection
- retrieval effectiveness
- relevance feedback
- initial query
- ad hoc retrieval
- query terms
- retrieved documents
- query dependent
- document retrieval
- information retrieval systems
- query specific
- vector space model
- text retrieval
- query processing
- language model
- language modeling
- relevance model
- information sources
- information retrieval
- average precision
- keywords
- test collection
- search queries
- retrieval model
- user queries
- co occurrence
- search engine
- keyword search
- document collections
- multimedia retrieval
- retrieval systems