code: def setUp(self):
      self.pred_masks = np.array(
          [
              [
                  [[True, True], [True, True]],
                  [[True, False], [False, True]],
              ]
          ]
      )
      self.pred_labels = np.array([[1, 2]])
      self.pred_scores = np.array([[0.8, 0.9]])
      self.gt_masks = np.array([[[[True, True], [True, True]]]])
      self.gt_labels = np.array([[1, 2]])
  
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 TestEvalInstanceSegmentationCOCOSomeClassNonExistent obj's underlying member method code with example usage: obj.setUp() without return types