INFO:tensorflow:Querying Tensorflow master (grpc://10.0.203.10:8470) for TPU system metadata.
INFO:tensorflow:Found TPU system:
INFO:tensorflow:*** Num TPU Cores: 8
INFO:tensorflow:*** Num TPU Workers: 1
INFO:tensorflow:*** Num TPU Cores Per Worker: 8
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:CPU:0, CPU, -1, 1941375595625340814)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:XLA_CPU:0, XLA_CPU, 17179869184, 9079881000847066378)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:0, TPU, 17179869184, 6922694346479333534)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:1, TPU, 17179869184, 14324637633413341896)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:2, TPU, 17179869184, 3528106575831937158)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:3, TPU, 17179869184, 13852141601322651612)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:4, TPU, 17179869184, 10344791506504172772)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:5, TPU, 17179869184, 16666353711371098164)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:6, TPU, 17179869184, 3428083526573573796)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU:7, TPU, 17179869184, 8632908473312514763)
INFO:tensorflow:*** Available Device: _DeviceAttributes(/job:worker/replica:0/task:0/device:TPU_SYSTEM:0, TPU_SYSTEM, 17179869184, 9715206562754100387)
WARNING:tensorflow:tpu_model (from tensorflow.contrib.tpu.python.tpu.keras_support) is experimental and may change or be removed at any time, and without warning.
---------------------------------------------------------------------------
InvalidArgumentError                      Traceback (most recent call last)
<ipython-input-11-b9f2a49a32bc> in <module>()
     11     model,
     12     strategy=tf.contrib.tpu.TPUDistributionStrategy(
---> 13         tf.contrib.cluster_resolver.TPUClusterResolver(TPU_WORKER)))

/usr/local/lib/python3.6/dist-packages/tensorflow/contrib/framework/python/framework/experimental.py in new_func(*args, **kwargs)
     62         'any time, and without warning.',
     63         decorator_utils.get_qualified_name(func), func.__module__)
---> 64     return func(*args, **kwargs)
     65   new_func.__doc__ = _add_experimental_function_notice_to_docstring(
     66       func.__doc__)

/usr/local/lib/python3.6/dist-packages/tensorflow/contrib/tpu/python/tpu/keras_support.py in tpu_model(model, strategy)
   2223     model_weights = None
   2224
-> 2225   setup_tpu_session(strategy._tpu_cluster_resolver)
   2226
   2227   # Force initialization of the CPU model in the TPU session.

/usr/local/lib/python3.6/dist-packages/tensorflow/contrib/tpu/python/tpu/keras_support.py in setup_tpu_session(cluster_resolver)
    159
    160   tpu_session = tf_session.Session(target=master, config=config)
--> 161   tpu_session.run(tpu.initialize_system())
    162   tpu_session._tpu_initialized = True
    163

/usr/local/lib/python3.6/dist-packages/tensorflow/contrib/tpu/python/tpu/tpu.py in initialize_system(embedding_config, job)
     92                    embedding_config.SerializeToString())
     93   with ops.device(_tpu_system_device_name(job)):
---> 94     return tpu_ops.configure_distributed_tpu(embedding_config=config_string)
     95
     96

/usr/local/lib/python3.6/dist-packages/tensorflow/contrib/tpu/ops/gen_tpu_ops.py in configure_distributed_tpu(embedding_config, tpu_embedding_config, is_global_init, name)
    298       else:
    299         message = e.message
--> 300       _six.raise_from(_core._status_to_exception(e.code, message), None)
    301   # Add nodes to the TensorFlow graph.
    302   if embedding_config is None:

/usr/local/lib/python3.6/dist-packages/six.py in raise_from(value, from_value)

InvalidArgumentError: /job:localhost/replica:0/task:0/device:TPU_SYSTEM:0 unknown device.