code: def testInfeedPytree(self):
      x = np.float32(1.5)
      y = np.reshape(np.arange(12, dtype=np.int16), (3, 4))
      to_infeed = dict(a=x, b=y)
      to_infeed_shape = dict(
          a=core.ShapedArray((), dtype=np.float32),
          b=core.ShapedArray((3, 4), dtype=np.int16),
      )
  
      @jax.jit
      def f(x):
          token = lax.create_token(x)
          res, token = lax.infeed(token, shape=to_infeed_shape)
          return res
  
      device = jax.local_devices()[0]
      # We must transfer the flattened data, as a tuple!!!
      flat_to_infeed, _ = jax.tree_util.tree_flatten(to_infeed)
      device.transfer_to_infeed(tuple(flat_to_infeed))
      self.assertAllClose(f(x), to_infeed)
  
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 3 for calling the InfeedTest obj's underlying member method code with example usage: obj.testInfeedPytree() and returns: res