Previous WSI evaluations in SemEval (Agirre and Soroa, 2007;Manandhar et al., 2010) have approached sense induction in terms of finding the single most salient sense of a target word given its context.
as shown in Erk and McCarthy (2009), multiple senses of the target word may be perceived by readers from different angles and a graded notion of sense labeling may be considered as the most appropriate.