Note this is the paper on the information theoretic metric, the "Variation of Information": "It is closely related to mutual information; indeed, it is a simpl

Note this is the paper on the information theoretic metric, the "Variation of Information": "It is closely related to mutual information; indeed, it is a simple linear expression involving the mutual information. Unlike the mutual information, however, the variation of information is a true metric, in that it obeys the triangle inequality" (https://en.wikipedia.org/wiki/Variation_of_information https://en.wikipedia.org/wiki/Variation_of_information).