code: def __call__(self, graph_wrappers, inputs):
      raise NotImplementedError
  
imports: import os
  import json
  import numpy
  import pgl
  import paddle.fluid
  import paddle.fluid.layers
  from ernie import ErnieModel
  from pgl.utils.logger import log
label_desc: Use image node_id 3 for calling the Encoder obj's underlying member method code with example usage: obj.__call__(graph_wrappers, inputs) without return types