How to use the blueqat.vqe.QaoaAnsatz function in blueqat

:param n_sample: The number of sampling time of each measurement in VQE.
                     If None, use calculated ideal value.
    :param edges: The edges list of the graph.
    :returns Vqe object
    """
    sampler = sampler or vqe.non_sampling_sampler
    minimizer = minimizer or vqe.get_scipy_minimizer(
        method="Powell",
        options={"ftol": 5.0e-2, "xtol": 5.0e-2, "maxiter": 1000, "disp": True}
    )
    hamiltonian = pauli.I() * 0

    for i, j in edges:
        hamiltonian += pauli.Z(i) * pauli.Z(j)

    return vqe.Vqe(vqe.QaoaAnsatz(hamiltonian, n_step), minimizer, sampler)