code: def main():
      with tfv1.gfile.FastGFile(sys.argv[1], "rb") as fin:
          graph_def = tfv1.GraphDef()
          graph_def.ParseFromString(fin.read())
  
          print("\n".join(sorted(set(n.op for n in graph_def.node))))
  
label_desc: Use image node_id 1 for calling a global function with example usage: main() without return types