code: def setUp(self):
      if tf is None:
          raise unittest.SkipTest("Test requires tensorflow")
      if xla_bridge.using_pjrt_c_api():
          raise unittest.SkipTest(
              "host_callback not implemented in PJRT C API"
          )
      super().setUp()
  
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 1 for calling the CallToTFTest obj's underlying member method code with example usage: obj.setUp() without return types