code: def ensure_dir(self, path_to_folder: str):
      os.makedirs(path_to_folder, exist_ok=True)
  
imports: import os
  import shutil
  import tempfile
  import unittest
  from typing import List, Tuple
  import numpy
  import torchvision
  from PIL.Image import Image
  from lightly.data import LightlyDataset
  from lightly.data._utils import check_images
label_desc: Use image node_id 1 for calling the TestLightlyDataset obj's underlying member method code with example usage: obj.ensure_dir(path_to_folder) without return types