code: def _prepare_idx_to_synset(self):
      URL = "https://heibox.uni-heidelberg.de/f/d835d5b6ceda4d3aa910/?dl=1"
      self.idx2syn = os.path.join(self.root, "index_synset.yaml")
      if not os.path.exists(self.idx2syn):
          download(URL, self.idx2syn)
  
imports: import glob
  import os
  import pickle
  import shutil
  import tarfile
  from functools import partial
  import albumentations
  import cv2
  import numpy
  import PIL
  import taming.data.utils
  import torchvision.transforms.functional
  import yaml
  from ldm.modules.image_degradation import degradation_fn_bsr, degradation_fn_bsr_light
  from omegaconf import OmegaConf
  from PIL import Image
  from taming.data.imagenet import ImagePaths, download, give_synsets_from_indices, retrieve, str_to_indices
  from torch.utils.data import Dataset, Subset
  from tqdm import tqdm
label_desc: Use image node_id 7 for calling the ImageNetBase obj's underlying member method code with example usage: obj._prepare_idx_to_synset() without return types