SQUAD Challenge的EM得分

Question

SQuAD Challenge根据F1和EM得分对结果进行排名。有很多关于F1分数的信息（精确度和召回率的函数）。但EM得分会是多少？

Answer 1

Exact  match.
This  metric  measures  the  percentage of predictions that 
match any one of the ground truth answers exactly.

根据here。