Finally, the accuracy Acc metric, used by<cite> Eskander et al. (2013)</cite> , is a simple string matching metric which enforces a word alignment that pairs words in the reference to those of the output. It is calculated by dividing the number of correct output words by the number of words in the input. This metric assumes no split errors in the data (a word incorrectly split into two words), which is the case in the data we are working with.