def get_maximum_fitness_instance_index(merged_population):
    """
    small helper function returning the instance of a population with maximum fitness

    """

    index = 0
    max_biased_fitness = 0

    for i, inst in enumerate(merged_population):
        if max_biased_fitness < inst.fitness:
            index = i
            max_biased_fitness = inst.fitness

    return index