code: def __init__(self, config):
      self.config = config
  
imports: import time
  import unittest
  import json
  import os
  import random
  from pgl.utils.data.dataset import Dataset, StreamDataset
  from pgl.utils.data.dataloader import Dataloader
label_desc: Use image node_id 1 to create a new Collate_fn object from inherited base classes: object with example: obj = Collate_fn(config)