code: def test_set_keys_multiple_index(self):
      self.dataset.keys = self.iterable((0, 2))
      self.assertEqual(self.dataset.keys, ("item0", "item2"))
      self.assertEqual(self.dataset[3], ("item0(3)", "item2(3)"))
  
imports: import numpy
  import unittest
  from chainercv.chainer_experimental.datasets.sliceable import GetterDataset
  from chainercv.utils import testing
label_desc: Use image node_id 9 for calling the TestGetterDataset obj's underlying member method code with example usage: obj.test_set_keys_multiple_index() without return types