Real-time Query Expansion in Relevance Models
Victor P. Lavrenko, James W Allan · 2006
Automatic query expansion is well known as a technique that improves query effectiveness on average. Unfortunately, it is usually very slow, increasing the time to process a query by 20 times or more. In this study, we use relevance models to show how the process can be made almost as fast as running a non-expanded query. 1.