code: def mock_tpu_devices(
      x,
      y,
      z,
      dev_kind,
      one_device_per_chip,
      num_slices=1,
      reorder=False,
  ):
      """Produce fake jax.devices() output for a TPU slice."""
      cores_per_chip = 1 if one_device_per_chip else 2
      nxd, nyd, nzd = (2, 2, 1)
      nxp, nyp, nzp = x // nxd, y // nyd, z // nzd
  
      def mock_tpu_device(
          core_on_chip, xd, yd, zd, xp, yp, zp, slice_index
      ):
          process_index = xp + nxp * (
              yp + nyp * (zp + nzp * slice_index)
          )
          coords = (xd + nxd * xp, yd + nyd * yp, zd + nzd * zp)
          device_id = core_on_chip + cores_per_chip * (
              xd
              + nxd
              * (
                  xp
                  + nxp
                  * (
                      yd
                      + nyd
                      * (
                          yp
                          + nyp * (zd + nzd * (zp + nzp * slice_index))
                      )
                  )
              )
          )
          return MockTpuDevice(
              device_id,
              "tpu",
              dev_kind,
              process_index,
              coords,
              core_on_chip,
              slice_index,
          )
  
      devices = [
          mock_tpu_device(
              core_on_chip, xd, yd, zd, xp, yp, zp, slice_index
          )
          for slice_index in range(num_slices)
          for zp in range(nzp)
          for yp in range(nyp)
          for xp in range(nxp)
          for zd in range(nzd)
          for yd in range(nyd)
          for xd in range(nxd)
          for core_on_chip in range(cores_per_chip)
      ]
      if reorder:
          devices = devices[::-1]
      _validate_mocked_process_indices(devices, one_device_per_chip)
      return devices
  
imports: import collections
  from collections.abc import Sequence
  import dataclasses
  import numpy
  from absl import logging
  from absl.testing import absltest
  from absl.testing import parameterized
  from jax.experimental import mesh_utils
  from jax.sharding import Mesh
  from jax._src import test_util
label_desc: Use image node_id 1 for calling a global function with example usage: mock_tpu_devices(x, y, z, dev_kind, one_device_per_chip, num_slices, reorder) and returns: devices, MockTpuDevice