class_docstr: Base Graph Model
class_docstr_tok: ["Base","Graph","Model"]
docstr: neighbor aggregation
docstr_tok: ["neighbor","aggregation"]
code: def neighbor_aggregator(self, feature):
      """neighbor aggregation"""
      raise NotImplementedError(
          "Please implement this method when you using graph wrapper for GNNs."
      )
  
imports: import os
  import re
  import time
  from random import random
  from functools import reduce, partial
  import numpy
  import multiprocessing
  import paddle
  import paddle.fluid
  import paddle.fluid
  import paddle.fluid.layers
  from pgl.graph_wrapper import GraphWrapper
  from pgl.layers.conv import gcn, gat
  from pgl.utils import paddle_helper
label_desc: Use image node_id 5 for calling the BaseGraph obj's underlying member method code with example usage: obj.neighbor_aggregator(feature) without return types