code: def numpartition_qaoa(n_step, nums, minimizer=None, sampler=None):
      
      hamiltonian = pauli.Expr.zero()
      for i, x in enumerate(nums):
          hamiltonian += pauli.Z[i] * x
      hamiltonian = (hamiltonian ** 2).simplify()
  
      return vqe.Vqe(vqe.QaoaAnsatz(hamiltonian, n_step), minimizer, sampler)
docs: Do the Number partition QAOA.
  
      :param n_step: The number of step of QAOA
      :param nums: The edges list of the graph.
      :returns Vqe object