code: def setUpClass(cls):
      base_url = "https://chainercv-models.preferred.jp/tests"
  
      cls.dataset = np.load(
          request.urlretrieve(
              os.path.join(
                  base_url,
                  "eval_instance_segmentation_coco_dataset_2018_07_06.npz",
              )
          )[0],
          encoding="latin1",
          allow_pickle=True,
      )
      cls.result = np.load(
          request.urlretrieve(
              os.path.join(
                  base_url,
                  "eval_instance_segmentation_coco_result_2019_02_12.npz",
              )
          )[0],
          encoding="latin1",
          allow_pickle=True,
      )
  
imports: import numpy
  import os
  from six.moves.urllib import request
  import unittest
  from chainer import testing
  from chainercv.evaluations import eval_instance_segmentation_coco
label_desc: Use image node_id 1 for calling the TestEvalInstanceSegmentationCOCO obj's underlying member method code with example usage: obj.setUpClass(cls) without return types