code: def get_example(self, i):
      img, label = super(InvalidImageDataset, self).get_example(i)[:2]
      return img[0], label
  
imports: import numpy
  import unittest
  from chainer.dataset import DatasetMixin
  from chainercv.utils import assert_is_semantic_segmentation_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: img,  label