code: def setUp(self):
      pass
  
file_path: chainer/tests/chainermn_tests/datasets_tests/test_empty_dataset.py
imports: import unittest
  import numpy
  from chainermn.datasets import create_empty_dataset
  import chainerx
label_desc: Use image node_id 1 for calling the TestEmptyDataset obj's underlying member method code with example usage: obj.setUp() without return types