code: def get_example(self, i):
      img = super(InvalidImageDataset, self).get_example(i)[0]
      rest = super(InvalidImageDataset, self).get_example(i)[1:]
      return (img[0],) + rest
  
imports: import numpy
  import unittest
  from chainer.dataset import DatasetMixin
  from chainercv.utils import assert_is_point_dataset
  from chainercv.utils import testing
label_desc: Use image node_id 1 for calling the InvalidImageDataset obj's underlying member method code with example usage: obj.get_example(i) and returns: unknown