code: def testNoIntegerGradient2(self, use_tape):
      with test_util.AbstractGradientTape(use_tape=use_tape) as tape:
          k = constant_op.constant([3, 4])
          x = math_ops.cast(k, dtypes.float32)
          tape.watch([k, x])
  
          y = x * x
          dy_dk = tape.gradient(y, k)
          self.assertIsNone(dy_dk)
  
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 6 for calling the GradientCorrectnessTest obj's underlying member method code with example usage: obj.testNoIntegerGradient2(use_tape) without return types