message: Fix error introduced in tpu estimator.
diff: @@ -668,7 +668,7 @@ class TPUEmbedding(object):
  master_job_name = tpu_system_metadata_lib.master_job(master,
  cluster_def)
  except ValueError as e:
  - raise ValueError(e.message + ' Please specify a master_job_name.')
  + raise ValueError(str(e) + ' Please specify a master_job_name.')
  self._hosts = []
  for device in tpu_system_metadata.devices:
  if 'device:CPU:' in device.name and (
  