Keyphrases
- database
- query processing
- rates of convergence
- query evaluation
- response time
- query formulation
- finite sample
- range queries
- data structure
- upper bound
- relevance feedback
- boolean queries
- query execution
- worst case
- query expansion
- neural network
- convergence speed
- keyword search
- retrieval systems
- vector space
- data sources
- lower bound
- learning algorithm
- data objects
- attribute values
- communication cost
- retrieval method
- query language
- upper and lower bounds
- original query
- databases