code: def test_transform_hamiltonian(
      symbols, geometry, generator, paulixops, paulix_sector, ham_ref
  ):
      r"""Test that transform_hamiltonian returns the correct hamiltonian."""
      mol = qml.qchem.Molecule(symbols, geometry)
      h = qml.qchem.diff_hamiltonian(mol)()
      ham_calc = qml.taper(h, generator, paulixops, paulix_sector)
      # sort Hamiltonian terms and then compare with reference
      sorted_terms = list(
          sorted(zip(ham_calc.terms()[0], ham_calc.terms()[1]))
      )
      for i, term in enumerate(sorted_terms):
          assert np.allclose(term[0], ham_ref.terms()[0][i])
          assert term[1].compare(ham_ref.terms()[1][i])
  
      # test arithmetic op compatibility:
      h_as_op = pauli_sentence(h).operation()
      generators_as_ops = [
          pauli_sentence(g).operation() for g in generator
      ]
  
      enable_new_opmath()
      ham_calc = qml.taper(
          h_as_op, generators_as_ops, paulixops, paulix_sector
      )
      disable_new_opmath()
  
      assert not isinstance(ham_calc, qml.Hamiltonian)
      ham_cal_as_hamiltonian = pauli_sentence(ham_calc).hamiltonian()
      sorted_terms = list(
          sorted(
              zip(
                  ham_cal_as_hamiltonian.terms()[0],
                  ham_cal_as_hamiltonian.terms()[1],
              )
          )
      )
      for i, term in enumerate(sorted_terms):
          assert np.allclose(term[0], ham_ref.terms()[0][i])
          assert term[1].compare(ham_ref.terms()[1][i])
  
imports: import functools
  import pytest
  import scipy
  import pennylane
  from pennylane import numpy
  from pennylane.pauli import pauli_sentence
  from pennylane.qchem.tapering import _kernel, _reduced_row_echelon, clifford, optimal_sector, taper_hf, taper_operation, _split_pauli_sentence, _taper_pauli_sentence
  from pennylane.operation import enable_new_opmath, disable_new_opmath
label_desc: Use image node_id 6 for calling a global function with example usage: test_transform_hamiltonian(symbols, geometry, generator, paulixops, paulix_sector, ham_ref) without return types