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-  课外天地 李树青  (http://www.njcie.com/bbs/index.asp)
--  信息检索原理课件  (http://www.njcie.com/bbs/list.asp?boardid=16)
----  LETOR：微软提供的学习排序（Learning to Rank）资源库  (http://www.njcie.com/bbs/dispbbs.asp?boardid=16&id=1815)
--  作者：admin
--  发布时间：2017/5/24 12:16:42
--  LETOR：微软提供的学习排序（Learning to Rank）资源库

https://www.microsoft.com/en-us/research/project/letor-learning-rank-information-retrieval/?from=http%3A%2F%2Fresearch.microsoft.com%2Fen-us%2Fum%2Fbeijing%2Fprojects%2Fletor%2Fletor4dataset.aspx