code: def testGpuMultiple(self):
      config.set_soft_device_placement(False)
      gpus = config.list_physical_devices("GPU")
  
      if len(gpus) < 2:
          self.skipTest("Need at least 2 GPUs")
  
      context.ensure_initialized()
  
      for i in range(0, len(gpus)):
          with ops.device("/device:GPU:" + str(i)):
              a = constant_op.constant(1.0)
              self.evaluate(a)
  
      with self.assertRaisesRegex(
          errors.InvalidArgumentError,
          "Could not satisfy device specification",
      ):
          with ops.device("/device:GPU:" + str(len(gpus))):
              a = constant_op.constant(1.0)
              self.evaluate(a)
  
imports: from absl.testing import parameterized
  from tensorflow.core.protobuf import cluster_pb2
  from tensorflow.core.protobuf import config_pb2
  from tensorflow.core.protobuf import rewriter_config_pb2
  from tensorflow.core.protobuf import tensorflow_server_pb2
  from tensorflow.python.eager import context
  from tensorflow.python.eager import def_function
  from tensorflow.python.framework import config
  from tensorflow.python.framework import constant_op
  from tensorflow.python.framework import dtypes
  from tensorflow.python.framework import errors
  from tensorflow.python.framework import ops
  from tensorflow.python.framework import test_ops
  from tensorflow.python.framework import test_util
  from tensorflow.python.ops import array_ops
  from tensorflow.python.ops import math_ops
  from tensorflow.python.platform import test
  from tensorflow.python.util import compat
label_desc: Use image node_id 4 for calling the DeviceTest obj's underlying member method code with example usage: obj.testGpuMultiple() without return types