code: def test_label(self):
      prev_label = self.dataset[2]["label"].item()
      self.dataset.label(2, (prev_label + 1) % 2)
      assert self.dataset[2]["label"].item() == ((prev_label - 1) % 2)
  
imports: import unittest
  import pytest
  from torch.utils.data import Dataset
  from transformers import AutoTokenizer
  from baal.active.dataset import ActiveLearningDataset
  from baal.active.dataset.nlp_datasets import HuggingFaceDatasets
  import datasets
label_desc: Use image node_id 4 for calling the HuggingFaceDatasetsTest obj's underlying member method code with example usage: obj.test_label() without return types