code: def setUp(self):
      self.data_length = 100
      self.dataset = list(range(self.data_length))
  
file_path: mmocr/tests/test_datasets/test_samplers/test_batch_aug.py
imports: from unittest import TestCase
  from unittest.mock import patch
  import torch
  from mmengine.logging import MMLogger
  from mmocr.datasets import BatchAugSampler
label_desc: Use image node_id 1 for calling the TestBatchAugSampler obj's underlying member method code with example usage: obj.setUp() without return types