code: def taper(h, generators, paulixops, paulix_sector):
      r"""Transform a Hamiltonian with a Clifford operator and then taper qubits.
  
      The Hamiltonian is transformed as :math:`H' = U^{\dagger} H U` where :math:`U` is a Clifford
      operator. The transformed Hamiltonian acts trivially on some qubits which are then replaced
      with the eigenvalues of their corresponding Pauli-X operator. The list of these
      eigenvalues is defined as the Pauli sector.
  
      Args:
          h (Operator): Hamiltonian as a PennyLane operator
          generators (list[Operator]): generators expressed as PennyLane Hamiltonians
          paulixops (list[Operation]): list of single-qubit Pauli-X operators
          paulix_sector (list[int]): eigenvalues of the Pauli-X operators
  
      Returns:
          (Operator): the tapered Hamiltonian
  
      **Example**
  
      >>> symbols = ["H", "H"]
      >>> geometry = np.array([[0.0, 0.0, -0.69440367], [0.0, 0.0, 0.69440367]])
      >>> H, qubits = qml.qchem.molecular_hamiltonian(symbols, geometry)
      >>> generators = qml.qchem.symmetry_generators(H)
      >>> paulixops = paulix_ops(generators, 4)
      >>> paulix_sector = [1, -1, -1]
      >>> H_tapered = taper(H, generators, paulixops, paulix_sector)
      >>> print(H_tapered)
        ((-0.321034397355757+0j)) [I0]
      + ((0.1809270275619003+0j)) [X0]
      + ((0.7959678503869626+0j)) [Z0]
      """
  
      ps_h = pauli_sentence(h)
      return _taper_pauli_sentence(
          ps_h, generators, paulixops, paulix_sector
      )
  
imports: import functools
  import itertools
  import numpy
  import scipy
  import pennylane
  from pennylane.operation import active_new_opmath
  from pennylane.pauli import PauliSentence, PauliWord, pauli_sentence, simplify
  from pennylane.pauli.utils import _binary_matrix_from_pws
  from pennylane.wires import Wires
label_desc: Use image node_id 8 for calling a global function with example usage: taper(h, generators, paulixops, paulix_sector) and returns: _taper_pauli_sentence