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Return an approximate maximum independent set.
G : NetworkX graph
iset : Set
The apx-maximum independent set
Finds the \(O(|V|/(log|V|)^2)\) apx of independent set in the worst case.
[R142] Boppana, R., & Halldórsson, M. M. (1992). Approximating maximum independent sets by excluding subgraphs. BIT Numerical Mathematics, 32(2), 180–196. Springer.