A first total number of nodes in a first node set directly linked to a first node can be computed. A second total number of nodes in a second node set directly linked to a second node can be computed. A shared total number of nodes in a union of the first node set and the second node set can be computed. A mutual information metric can then be computed from the first total, the second total, and the shared total. A decision as to whether a new connection should be added between the first node and the second node, which were not previously directly connected, can be determined from the value of mutual information metric.