code: def test_grad(self, ad="simple"):
      call_tf = CALL_TF_IMPLEMENTATIONS[ad]
  
      def f_jax(x):
          return 3.0 * jnp.sin(2.0 * x)
  
      def f_outside(x):
          return 3.0 * call_tf(tf.math.sin, 2.0 * x, result_shape=x)
  
      x = 4.0
      self.assertAllClose(f_jax(x), f_outside(x))
  
      grad_f = jax.grad(f_outside)(x)
      self.assertAllClose(jax.grad(f_jax)(x), grad_f)
  
imports: from typing import Callable
  import unittest
  from absl.testing import absltest
  from absl.testing import parameterized
  import jax
  from jax import config
  from jax import numpy
  from jax._src import test_util
  from jax._src import xla_bridge
  from jax.experimental import host_callback
  import numpy
label_desc: Use image node_id 3 for calling the CallToTFTest obj's underlying member method code with example usage: obj.test_grad(ad) and returns: unknown, unknown