Systems also vary in how they incorporate feedback, such as "must- * Work performed at University of Maryland, College Park link" and "cannot-link" constraints (Andrzejewski et al., 2009;Hu et al., 2014), informed priors (Smith et al., 2018), or document labels .
evaluations of these systems are either not comparative (Choo et al., 2013;Lee et al., 2017) or compare against noninteractive models (Hoque and Carenini, 2015;Hu et al., 2014) or for only a limited set of refinements Xie et al., 2015).