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课外天地 李树青 http://www.njcie.com
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