fault in the implementation of omega index

[CheYulin]

fault in the implementation of omega index(metric to measure the difference between the result and ground truth)

omega index requires a pair of objects {o1, o2} occur together in exactly j communities in the result and ground truth.

e.g, {1,2} exactly in 2 comms: comm1, comm2 in the result(j=2) {1,2} exactly in 2 comms: comm3, comm4 in the ground truth(j=2)