code: def test_slice_keys_invalid_name(self):
      with self.assertRaises(KeyError):
          self.dataset.slice[:, "invalid"]
  
imports: import numpy
  import six
  import unittest
  from chainercv.chainer_experimental.datasets.sliceable import SliceableDataset
  from chainercv.utils import testing
label_desc: Use image node_id 11 for calling the TestSliceableDataset obj's underlying member method code with example usage: obj.test_slice_keys_invalid_name() without return types