class_docstr: Test the label method on parametric ops
docstr: Test label methods work with tensorflow variables
code: def test_label_tf(self):
      """Test label methods work with tensorflow variables"""
      import tensorflow as tf
  
      op1 = qml.TRX(tf.Variable(0.123456), wires=0)
      assert op1.label(decimals=2) == "TRX\n(0.12)"
  
imports: import copy
  from functools import reduce
  import pytest
  import numpy
  from gate_data import TSHIFT, TCLOCK
  from pennylane import numpy
  import pennylane
  from pennylane.wires import Wires
label_desc: Use image node_id 3 for calling the TestLabel obj's underlying member method code with example usage: obj.test_label_tf() without return types