code: def testInfeedThenOutfeed(self):
      hcb.stop_outfeed_receiver()
  
      @jax.jit
      def f(x):
          token = lax.create_token(x)
          y, token = lax.infeed(
              token, shape=core.ShapedArray((3, 4), jnp.float32)
          )
          token = lax.outfeed(token, y + np.float32(1))
          return x - 1
  
      x = np.float32(7.5)
      y = self.rng().randn(3, 4).astype(np.float32)
      execution = threading.Thread(target=lambda: f(x))
      execution.start()
      device = jax.local_devices()[0]
      device.transfer_to_infeed((y,))
      (out,) = device.transfer_from_outfeed(
          xla_client.shape_from_pyval(
              (y,)
          ).with_major_to_minor_layout_if_absent()
      )
      execution.join()
      self.assertAllClose(out, y + np.float32(1))
  
file_path: jax/tests/infeed_test.py
imports: import threading
  from unittest import SkipTest
  from absl.testing import absltest
  import jax
  from jax import lax, numpy
  from jax import config
  from jax.experimental import host_callback
  from jax._src import core
  from jax._src import xla_bridge
  from jax._src.lib import xla_client
  import jax._src.test_util
  import numpy
label_desc: Use image node_id 4 for calling the InfeedTest obj's underlying member method code with example usage: obj.testInfeedThenOutfeed() and returns: unknown