code: def __len__(self):
      return self.graph.num_graph
  
imports: import os
  import sys
  import json
  import glob
  import copy
  import time
  import tqdm
  import argparse
  import numpy
  import pickle
  from collections import OrderedDict, namedtuple
  from ogb.lsc import PCQM4MDataset, PCQM4MEvaluator
  from rdkit.Chem import AllChem
  import paddle
  import paddle.nn
  import paddle.nn.functional
  import pgl
  from pgl.utils.data.dataset import Dataset, StreamDataset, HadoopDataset
  from pgl.utils.data import Dataloader
  from pgl.utils.logger import log
  from utils.config import prepare_config, make_dir
label_desc: Use image node_id 5 for calling the AuxDataset obj's underlying member method code with example usage: obj.__len__() and returns: self