code: def setUp(self) -> None:
      tmp_dir, folder_names, sample_names = self.create_dataset(
          n_subfolders=5, n_samples_per_subfolder=5
      )
      self.input_dir = tmp_dir
  
file_path: lightly/tests/data/test_LightlySubset.py
imports: import random
  import tempfile
  import unittest
  from typing import List, Tuple
  from lightly.data.dataset import LightlyDataset
  from lightly.data.lightly_subset import LightlySubset
  from tests.data.test_LightlyDataset import TestLightlyDataset
label_desc: Use image node_id 1 for calling the TestLightlySubset obj's underlying member method code with example usage: obj.setUp() without return types