def _score(cluster):
    x, y = zip(*cluster)[:2]
    return min(len(set(x)), len(set(y)))
Generate a new set of certificates for the given nodes.
dataset/ETHPy150Open tanghaibao/jcvi/compara/synteny.py/_score--crossover with--dataset/ETHPy150Open ClusterHQ/flocker/admin/acceptance.py/generate_certificates