code: def testNoIntegerGradient6(self, use_tape):
      with test_util.AbstractGradientTape(
          use_tape=use_tape, persistent=True
      ) as tape:
          k = constant_op.constant(3)
          tape.watch(k)
  
          x = math_ops.cast(k, dtypes.float32)
          grad_1 = tape.gradient(k * k, k)
          grad_2 = tape.gradient(x * x, k)
          grad_3 = tape.gradient(math_ops.square(k), k)
          grad_4 = tape.gradient(math_ops.square(x), k)
          self.assertIsNone(grad_1)
          self.assertIsNone(grad_2)
          self.assertIsNone(grad_3)
          self.assertIsNone(grad_4)
  
imports: from absl.testing import parameterized
  import numpy
  from tensorflow.python.eager import context
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
label_desc: Use image node_id 10 for calling the GradientCorrectnessTest obj's underlying member method code with example usage: obj.testNoIntegerGradient6(use_tape) without return types