message: Add the implementation of _inputs() function
diff: @@ -2663,6 +2663,9 @@ class MatchingFilesDataset(Dataset):
  def _as_variant_tensor(self):
  return gen_dataset_ops.matching_files_dataset(self._patterns)
  + def _inputs(self):
  + return []
  +
  @property
  def output_classes(self):
  return ops.Tensor
  