LETOR is a package of benchmark data sets for research on LEarning TO Rank, which contains standard features, relevance judgments, data partitioning, evaluation tools, and several baselines. Version 1.0 was released in April 2007. Version 2.0 was released in Dec. 2007. Version 3.0 was released in Dec. 2008. This version, 4.0, was released in July 2009. Very different from previous versions (V3.0 i
![LETOR: Learning to Rank for Information Retrieval - Microsoft Research](https://cdn-ak-scissors.b.st-hatena.com/image/square/785af067ea0ae941e85f9c4fdb5e7c5662894e02/height=288;version=1;width=512/https%3A%2F%2Fwww.microsoft.com%2Fen-us%2Fresearch%2Fuploads%2Fprod%2F2018%2F11%2FAutomated_Hero_Image_MSR_Social_11_2018_1200x627.png)