code: def _build_graph(self, only_forward=False):
      raise NotImplementedError
  
imports: import os
  import shutil
  import tensorflow
  import numpy
  import time
  from datetime import timedelta
  import json
  import pickle
label_desc: Use image node_id 4 for calling the BasicModel obj's underlying member method code with example usage: obj._build_graph(only_forward) without return types