tensorflow/models · error · ValueError

If the function_keys is a list, it must contain a single ele

Error message

If the function_keys is a list, it must contain a single element. %s

What it means

Error "If the function_keys is a list, it must contain a single element. %s" thrown in tensorflow/models.

Source

Thrown at official/core/export_base.py:137

  Returns:
    The savedmodel directory path.
  """
  ckpt_dir_or_file = checkpoint_path
  if ckpt_dir_or_file is not None and tf.io.gfile.isdir(ckpt_dir_or_file):
    ckpt_dir_or_file = tf.train.latest_checkpoint(ckpt_dir_or_file)
  if ckpt_dir_or_file:
    if checkpoint is None:
      checkpoint = tf.train.Checkpoint(model=export_module.model)
    checkpoint.read(
        ckpt_dir_or_file).assert_existing_objects_matched().expect_partial()
  if isinstance(function_keys, list):
    if len(function_keys) == 1:
      function_keys = {
          function_keys[0]: tf.saved_model.DEFAULT_SERVING_SIGNATURE_DEF_KEY
      }
    else:
      raise ValueError(
          'If the function_keys is a list, it must contain a single element. %s'
          % function_keys)

  signatures = export_module.get_inference_signatures(function_keys)
  if timestamped:
    export_dir = get_timestamped_export_dir(export_savedmodel_dir).decode(
        'utf-8')
  else:
    export_dir = export_savedmodel_dir
  tf.saved_model.save(
      export_module, export_dir, signatures=signatures, options=save_options)
  return export_dir


def get_timestamped_export_dir(export_dir_base):
  """Builds a path to a new subdirectory within the base directory.

  Args:

View on GitHub (pinned to e006f5f0d5)

When it happens

Trigger: Thrown at official/core/export_base.py:137 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of tensorflow/models@e006f5f0d5 (2026-08-24). Data as JSON: /api/errors/e9b41635c1ecc5dd. Report an issue: GitHub.