code: def diff_hamiltonian(mol, cutoff=1.0e-12, core=None, active=None):
      r"""Return a function that computes the qubit Hamiltonian.
  
      Args:
          mol (~qchem.molecule.Molecule): the molecule object
          cutoff (float): cutoff value for discarding the negligible electronic integrals
          core (list[int]): indices of the core orbitals
          active (list[int]): indices of the active orbitals
  
      Returns:
          function: function that computes the qubit hamiltonian
  
      **Example**
  
      >>> symbols  = ['H', 'H']
      >>> geometry = np.array([[0.0, 0.0, 0.0], [0.0, 0.0, 1.0]], requires_grad = False)
      >>> alpha = np.array([[3.42525091, 0.62391373, 0.1688554],
      >>>                   [3.42525091, 0.62391373, 0.1688554]], requires_grad=True)
      >>> mol = qml.qchem.Molecule(symbols, geometry, alpha=alpha)
      >>> args = [alpha]
      >>> h = diff_hamiltonian(mol)(*args)
      >>> h.coeffs
      array([ 0.29817879+0.j,  0.20813365+0.j,  0.20813365+0.j,
               0.17860977+0.j,  0.04256036+0.j, -0.04256036+0.j,
              -0.04256036+0.j,  0.04256036+0.j, -0.34724873+0.j,
               0.13290293+0.j, -0.34724873+0.j,  0.17546329+0.j,
               0.17546329+0.j,  0.13290293+0.j,  0.18470917+0.j])
      """
  
      def _molecular_hamiltonian(*args):
          r"""Compute the qubit hamiltonian.
  
          Args:
              *args (array[array[float]]): initial values of the differentiable parameters
  
          Returns:
              Hamiltonian: the qubit Hamiltonian
          """
  
          h_ferm = fermionic_hamiltonian(mol, cutoff, core, active)(
              *args
          )
  
          return qubit_observable(h_ferm)
  
      return _molecular_hamiltonian
  
imports: import pennylane
  from .hartree_fock import nuclear_energy, scf
  from .observable_hf import fermionic_observable, qubit_observable
label_desc: Use image node_id 3 for calling a global function with example usage: diff_hamiltonian(mol, cutoff, core, active) and returns: _molecular_hamiltonian, qubit_observable