Keyphrases
- expansion terms
- query expansion
- original query
- pseudo relevance feedback
- term selection
- selection criteria
- relevance feedback
- retrieved documents
- retrieval effectiveness
- automatic query expansion
- query terms
- relevant documents
- query dependent
- information retrieval systems
- ad hoc retrieval
- initial query
- text retrieval
- query processing
- relevance model
- information retrieval
- document retrieval
- user queries
- query specific
- text categorization
- language model
- language modeling
- retrieval systems
- test collection
- machine learning
- keywords
- web search
- query formulation
- co occurrence
- ranking algorithm
- average precision
- learning algorithm
- query logs