“…Unfortunately, some of the hubs are bad in the sort of sense that they may mislead machine learning algorithms. The presence of hubs have been studied primarily in context of classification, clustering and instance selection, see (Radovanović et al, 2010a), (Tomašev and Mladenić, 2013), (Radovanović et al, 2009), (Radovanović et al, 2010b), (Tomašev et al, 2011), (Tomašev et al, 2015b), , and (Tomašev et al, 2015a) for a survey.…”