<blockquote>
<p><strong>Exact match.</strong> This  metric  measures  the  percentage of predictions
that  match any one of the ground truth answers exactly.</p>
</blockquote>
<p>According to <a href="https://arxiv.org/pdf/1606.05250.pdf" rel="nofollow noreferrer">here</a>.</p>
EM score in SQuAD Challenge
<p>The <a href="https://rajpurkar.github.io/SQuAD-explorer/" rel="noreferrer">SQuAD Challenge</a> ranks the results against the F1 and EM scores. There is a lot of information about the F1 score (a function of precision and recall). But what would the EM score be?</p>