code: def diagonalize_pauli_word(pauli_word):
      """Transforms the Pauli word to diagonal form in the computational basis.
  
      Args:
          pauli_word (Observable): the Pauli word to diagonalize in computational basis
  
      Returns:
          Observable: the Pauli word diagonalized in the computational basis
  
      Raises:
          TypeError: if the input is not a Pauli word, i.e., a Pauli operator,
              :class:`~.Identity`, or :class:`~.Tensor` instances thereof
  
      **Example**
  
      >>> diagonalize_pauli_word(qml.PauliX('a') @ qml.PauliY('b') @ qml.PauliZ('c'))
      PauliZ(wires=['a']) @ PauliZ(wires=['b']) @ PauliZ(wires=['c'])
      """
  
      if not is_pauli_word(pauli_word):
          raise TypeError(
              f"Input must be a Pauli word, instead got: {pauli_word}."
          )
  
      paulis_with_identity = (
          qml.PauliX,
          qml.PauliY,
          qml.PauliZ,
          qml.Identity,
      )
      diag_term = None
  
      if isinstance(pauli_word, Tensor):
          for sigma in pauli_word.obs:
              if sigma.name != "Identity":
                  if diag_term is None:
                      diag_term = qml.PauliZ(wires=sigma.wires)
                  else:
                      diag_term @= qml.PauliZ(wires=sigma.wires)
  
      elif isinstance(pauli_word, paulis_with_identity):
          sigma = pauli_word
          if sigma.name != "Identity":
              diag_term = qml.PauliZ(wires=sigma.wires)
  
      if diag_term is None:
          diag_term = qml.Identity(pauli_word.wires.tolist()[0])
  
      return diag_term
  
imports: from functools import lru_cache, reduce, singledispatch
  from itertools import product
  from typing import List, Union
  from warnings import warn
  import numpy
  import pennylane
  from pennylane.operation import Tensor
  from pennylane.ops import Hamiltonian, Identity, PauliX, PauliY, PauliZ, Prod, SProd
  from pennylane.tape import OperationRecorder
  from pennylane.wires import Wires
label_desc: Use image node_id 25 for calling a global function with example usage: diagonalize_pauli_word(pauli_word) and returns: diag_term