code: def fermionic_hamiltonian(
      mol, cutoff=1.0e-12, core=None, active=None
  ):
      r"""Return a function that computes the fermionic 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 fermionic 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 = fermionic_hamiltonian(mol)(*args)
      """
  
      def _fermionic_hamiltonian(*args):
          r"""Compute the fermionic hamiltonian.
  
          Args:
              *args (array[array[float]]): initial values of the differentiable parameters
  
          Returns:
              FermiSentence: fermionic Hamiltonian
          """
  
          core_constant, one, two = electron_integrals(
              mol, core, active
          )(*args)
  
          return fermionic_observable(core_constant, one, two, cutoff)
  
      return _fermionic_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 2 for calling a global function with example usage: fermionic_hamiltonian(mol, cutoff, core, active) and returns: _fermionic_hamiltonian, fermionic_observable