code: def _device_to_device_funcs():
      """Generates device-to-device transfer functions."""
      if len(jax.local_devices()) < 2:
          # device-to-device tests require at least 2 devices.
          return []
  
      with jax.transfer_guard_host_to_device("allow"):
          device_arrays = [jnp.ones(1) for _ in range(2)]
      return [
          # (function name, is an explicit transfer?, function)
          (
              "device_to_device_jax_device_put",
              True,
              lambda: jax.device_put(
                  device_arrays[0], device=jax.local_devices()[1]
              ),
          ),
          (
              "device_to_device_jax_jit",
              False,
              lambda: jax.jit(
                  lambda x: x, device=jax.local_devices()[1]
              )(device_arrays[1]),
          ),
      ]
  
imports: import contextlib
  import pickle
  from absl.testing import absltest
  from absl.testing import parameterized
  import numpy
  import jax
  import jax._src.test_util
  import jax.numpy
  from jax import config
label_desc: Use image node_id 2 for calling a global function with example usage: _device_to_device_funcs() and returns: list, list