As expected due to the small-world nature of the Word-Net graph (Steyvers and Tenenbaum, 2005), most synsets are not similar at all: with JCN-S, the overwhelming majority of pairs feature similarity very close to zero; with LCH, most pairs have similarity below 1.0.
we filtered low-similarity pairs out, using similarity threshold of 0.1 for the JCN-S and ShP datasets, 0.3 for the WuP dataset and 1.5 for the LCH dataset (due to substantial differences in similarities distributions, as shown in Figure 1).