Nassiri, Isar Masoudi-Nejad, Ali Jalili, Mahdi Moeini, Ali Weighting of the edge by Normalize SimilarityIndex (NSI). <p> and are connected with one directed edge (C<sub>ij</sub> = 1). Node and are also connected with four common node (V<sub>m−1</sub>,V<sub>m−2</sub>,V<sub>m−3</sub>,V<sub>m−4</sub>), and in total with eight distinct neighbors (V<sub>m−1</sub>,V<sub>m−2</sub>,V<sub>m−3</sub>,V<sub>m−4</sub>,V<sub>a</sub>, V<sub>b</sub>, V<sub>c</sub>, V<sub>d</sub>). The NSI will then be NSI<sub>ij</sub>  = 5/9 = 0.55.</p> normalize;similarityindex 2012-06-21
    https://plos.figshare.com/articles/figure/_Weighting_of_the_edge_by_Normalize_SimilarityIndex_NSI_/291142
10.1371/journal.pone.0039643.g001