The Vendi Score. The Vendi score Friedman and Dieng ( ) is an interpretable diversity metric that quantitatively describes how diverse a collection of items is. It is the effective number of dissimilar elements in the collection being evaluated for diversity. Given a collection of N items, the maximum possible value of the Vendi Score is N , when all items in the collection are uniquely distinct from each other. The measure of similarity between the items in the collection is an input to the Vendi Score, which allows for a flexible specification of any form of similarity. More specifically, the Vendi Score of a collection of samples {x 1 , x 2 , . . . , x M } is defined as the Shannon entropy of the eigenvalues of a similarity matrix,