The backgrovind of this paper is text retrieval conference ( trec ) , high accuracy retrieval of document ( hard ) . in this paper , the characteristics of traditional vector model and probabilistic model are introduced 本文的提出背景是第12届国际文本检索大会的子项目,高精度文本检索( textretrievalconference12 , highaccuracyretrievalofdocumenttrack ) 。
The Text REtrieval Conference (TREC) is an on-going series of workshops focusing on a list of different information retrieval (IR) research areas, or tracks. It is co-sponsored by the National Institute of Standards and Technology (NIST) and the Intelligence Advanced Research Projects Activity (part of the office of the Director of National Intelligence), and began in 1992 as part of the TIPSTER Text program.