Similarly, a large body of work exists in sentence fusion (Barzilay et al., 1999;Barzilay and McKeown, 2005;Marsi and Krahmer, 2005;Filippova, 2010;Thadani and McKeown, 2013).
when computing purity, a gold-standard cluster is the union of the fragments originating from a corpus sentence and all fragments that contain coreferent entity mentions with said sentence.