If i want to compare two communities with compare() and both are hierarchical with overlapping communities so few vertices may have multiple memberships. but communities object has single membership for each vertex. how will compare work in such case.
Also if i have a graph with 6 nodes and community is #1 - { 1-2-3 } #2 - {4-5-6}
but some community detection algo finds #1-{4-5-6} and #2-{1-2-3}. on same graph. how will compare() work as communities are same but id are different.