code: def _get_two_devices(self, require_same_type=False):
      tpus = extensions.tpu_devices()
      if FLAGS.requires_tpu:
          if len(tpus) == 2:
              res = tpus
          else:
              raise ValueError(
                  "This test requires 2 TPU cores but %s are found"
                  % len(tpus)
              )
      else:
          if len(tpus) == 2:
              res = tpus
          elif self._hasGPU() and not require_same_type:
              res = ("CPU:0", "GPU:0")
          else:
              res = ("CPU:0", "CPU:1")
      return res
  
imports: import functools
  import itertools
  from absl import flags
  from absl.testing import parameterized
  from jax import lax
  import numpy
  import tensorflow.compat.v2
  from trax.tf_numpy import extensions
  import trax.tf_numpy.numpy
label_desc: Use image node_id 33 for calling the ExtensionsTest obj's underlying member method code with example usage: obj._get_two_devices(require_same_type) and returns: res