code: def setUpClass(cls):
      base_url = "https://chainercv-models.preferred.jp/tests"
  
      cls.dataset = np.load(
          request.urlretrieve(
              os.path.join(
                  base_url, "eval_detection_voc_dataset_2017_06_06.npz"
              )
          )[0],
          allow_pickle=True,
      )
      cls.result = np.load(
          request.urlretrieve(
              os.path.join(
                  base_url, "eval_detection_voc_result_2017_06_06.npz"
              )
          )[0],
          allow_pickle=True,
      )
  
imports: from __future__ import division
  import numpy
  import os
  from six.moves.urllib import request
  import unittest
  from chainer import testing
  from chainercv.evaluations import calc_detection_voc_ap
  from chainercv.evaluations import calc_detection_voc_prec_rec
  from chainercv.evaluations import eval_detection_voc
label_desc: Use image node_id 1 for calling the TestEvalDetectionVOCAP obj's underlying member method code with example usage: obj.setUpClass(cls) without return types