Nitpicking, but why are they claiming to provide MAP (mean average precision) scores when their description and equation indicates that they are computing average precision, not MAP. According to the definition of MAP [1] that they link to, MAP is computed across multiple queries while average precision is computed for one [2]. Furthermore, they truncate their calculation to only consider the top 3 cited papers (i.e., they don't go all the way to 100% recall), so it's not even really the average precision.<p>[1] <a href="http://en.wikipedia.org/wiki/Information_retrieval#Mean_average_precision" rel="nofollow">http://en.wikipedia.org/wiki/Information_retrieval#Mean_aver...</a><p>[2] <a href="http://en.wikipedia.org/wiki/Information_retrieval#Average_precision" rel="nofollow">http://en.wikipedia.org/wiki/Information_retrieval#Average_p...</a>