In an argumentation setting, a semantics evaluates the overall acceptability of arguments. Consequently, it reveals the global loss incurred by each argument due to attacks. However, it does not say anything on the contribution of each attack to that loss. This paper introduces the novel concept of contribution measure for evaluating those contributions. It starts by defining a set of axioms that a reasonable measure would satisfy, then shows that the Shapley value is the unique measure that satisfies them. Finally, it investigates the properties of the latter under some existing semantics.
Concerning the gradual semantics, Amgoud and al. REF have introduced the concept of contribution measure for evaluating the intensity of each attack in an argumentation graph.
Measuring the Intensity of Attacks in Argumentation Graphs with Shapley Value
IJCAI
Computer Science