message: Add brackets to multi-line strings to make sure the entire string is captured.
  Closes
diff: @@ -386,8 +386,9 @@ def experimental_tpu_test_loop(model,
  try:
  _, batch_outs = K.batch_get_value([test_op, output_tensors])
  except errors.OutOfRangeError:
  - warning_msg = 'Make sure that your dataset can generate at least '
  - '`steps` batches (in this case, {} batches).'.format(steps)
  + warning_msg = (
  + 'Make sure that your dataset can generate at least '
  + '`steps` batches (in this case, {} batches).'.format(steps))
  logging.warning('Your dataset iterator ran out of data; '
  'interrupting evaluation. ' + warning_msg)
  @@ -533,8 +534,9 @@ def experimental_tpu_predict_loop(model,
  _, batch_outs = K.batch_get_value([predict_ops, output_tensors])
  except errors.OutOfRangeError:
  - warning_msg = 'Make sure that your dataset can generate at least '
  - '`steps` batches (in this case, {} batches).'.format(steps)
  + warning_msg = (
  + 'Make sure that your dataset can generate at least '
  + '`steps` batches (in this case, {} batches).'.format(steps))
  logging.warning('Your dataset iterator ran out of data; '
  'interrupting evaluation. ' + warning_msg)
  