code: def token(self):
      if self.token_list:
          tok = self.token_list.pop(0)
          return tok
      return None
  
imports: import numpy
  import tensorflow.compat.v1
  from tensorflow.core.framework.tensor_pb2 import TensorProto
  from tensorflow.core.framework.tensor_shape_pb2 import TensorShapeProto
label_desc: Use image node_id 5 for calling the RefineGraph obj's underlying member method code with example usage: obj.token() and returns: None, tok