Supervised, unsupervised, and knowledge-based approaches have been studied for WSD (Navigli, 2009).
for all-words WSD, where all words in a corpus need to be annotated with word senses, it has proven extremely challenging to beat the strong baseline, which always assigns the most frequent sense of a word without considering the context (Pradhan et al., 2007a;Navigli, 2009;Navigli et al., 2013;Moro and Navigli, 2015).