O r i g i n a l Q u e r y E x p a n d e d Q u e r y I n i t i a l R e t r i e v a l F i n a l R e t r i e v a l Q u e r y E x p a n s i o n D o c u m e n t S e t I n i t i a l R a n k i n g D o c u m e n t s F i n a l R a n k i n g D o c u m e n t s The rest of this paper is organized as following.
they are both used in a lot of experiments and applications.