docstr: Current testing platform, one of CPU, GPU, TPU.
docstr_tok: ["Current","testing","platform",",","one","of","CPU",",","GPU",",","TPU","."]
code: def testing_platform(self):
      """Current testing platform, one of CPU, GPU, TPU."""
      if self.device in ["CPU", "XLA_CPU"]:
          return "CPU"
      elif self.device in ["GPU", "XLA_GPU"]:
          if test.is_built_with_rocm():
              return "ROCM"
          else:
              return "CUDA"
      elif self.device in ["TPU", "XLA_TPU"]:
          return "TPU"
      else:
          assert False, f"Unexpected {self.device=}"
  
imports: import os
  import re
  from typing import Optional, Sequence
  import unittest
  from absl.testing import parameterized
  import numpy
  from tensorflow.compiler.mlir.stablehlo import stablehlo
  from tensorflow.compiler.tests import xla_test
  from tensorflow.compiler.tf2xla.ops import gen_xla_ops
  from tensorflow.compiler.tf2xla.python import xla
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import function
  from tensorflow.python.framework import ops
  from tensorflow.python.platform import googletest
  from tensorflow.python.platform import test
label_desc: Use image node_id 2 for calling the XlaCallModuleOpTest obj's underlying member method code with example usage: obj.testing_platform() and returns: str, str, str, str