message: Fixed the bug that predict input_fn requires the labels.
diff: @@ -2308,6 +2308,11 @@ class _InputsWithStoppingSignals(_Inputs):
  """
  def _map_fn(*args):
  + """The map fn to insert signals."""
  + if len(args) == 1:
  + # Unpack the single Tensor/dict argument as features. This is required
  + # for the input_fn returns no labels.
  + args = args[0]
  features, labels = _Inputs._parse_inputs(args)
  new_input_dict = {}
  new_input_dict['features'] = features
  