[4] DiShIn re-defines the shared information content between two concepts as the average of all their disjunctive ancestors, assuming that an ancestor is disjunctive if the difference between the number of distinct paths from the concepts to it is different from that of any other more informative ancestor.
DiShIn is an improvement of GraSM[5] in terms of computational efficiency and in the management of parallel interpretations.
For example, palladium, platinum, silver and gold are considered to be precious metals, and silver, gold and copper considered to be coinage metals.
When calculating the semantic similarity between platinum and palladium, DiShIn starts by calculating the number of paths difference for all their common ancestors: For both metal and precious, we have only one path from each concept, so we have a path difference of zero for both common ancestors.
When calculating the semantic similarity between silver and gold, DiShIn starts by calculating the number of paths difference for all their common ancestors: As in the case of platinum and palladium, here all common ancestors have a path difference of zero, since silver and gold share the same relationships and therefore have parallel interpretations.