code: def create_old_heterograph_files():
      path = os.path.join(os.path.dirname(__file__), "data/hetero1.bin")
      g_list0 = create_heterographs(F.int64) + create_heterographs(
          F.int32
      )
      labels_dict = {"graph_label": F.ones(54)}
      dgl.save_graphs(path, g_list0, labels_dict)
  
imports: import os
  import tempfile
  import time
  import unittest
  import warnings
  import backend
  import dgl
  import dgl.ndarray
  import numpy
  import pytest
  import scipy
  from dgl.data.utils import load_labels, load_tensors, save_tensors
label_desc: Use image node_id 14 for calling a global function with example usage: create_old_heterograph_files() without return types