class_docstr: Test different interface matrices with qutrit.
class_docstr_tok: ["Test","different","interface","matrices","with","qutrit","."]
docstr: Test matrix cache labelling with tf interface.
docstr_tok: ["Test","matrix","cache","labelling","with","tf","interface","."]
code: def test_labelling_tf_variable(self):
      """Test matrix cache labelling with tf interface."""
  
      import tensorflow as tf
  
      mat = tf.Variable([[1, 0, 0], [0, -1, 0], [0, 0, 1]])
  
      self.check_interface(mat)
  
imports: import pytest
  import numpy
  from scipy.stats import unitary_group
  from gate_data import TSWAP
  import pennylane
  from pennylane.wires import Wires
  from pennylane.operation import DecompositionUndefinedError
label_desc: Use image node_id 3 for calling the TestInterfaceMatricesLabel obj's underlying member method code with example usage: obj.test_labelling_tf_variable() without return types