code: def test_permuted_sub_dataset(self):
      original = [1, 2, 3, 4, 5]
      subset = datasets.SubDataset(original, 1, 4, [2, 0, 3, 1, 4])
      self.assertEqual(len(subset), 3)
      self.assertEqual(subset[0], 1)
      self.assertEqual(subset[1], 4)
      self.assertEqual(subset[2], 2)
  
imports: import unittest
  from chainer import datasets
  from chainer import testing
label_desc: Use image node_id 3 for calling the TestSubDataset obj's underlying member method code with example usage: obj.test_permuted_sub_dataset() without return types