code: def test(self):
      result = eval_instance_segmentation_coco(
          self.pred_masks,
          self.pred_labels,
          self.pred_scores,
          self.gt_masks,
          self.gt_labels,
      )
      self.assertEqual(
          result["ap/iou=0.50:0.95/area=all/max_dets=100"].shape, (3,)
      )
      self.assertTrue(
          np.isnan(result["ap/iou=0.50:0.95/area=all/max_dets=100"][0])
      )
      self.assertEqual(
          np.nanmean(
              result["ap/iou=0.50:0.95/area=all/max_dets=100"][1:]
          ),
          result["map/iou=0.50:0.95/area=all/max_dets=100"],
      )
  
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 2 for calling the TestEvalInstanceSegmentationCOCOSomeClassNonExistent obj's underlying member method code with example usage: obj.test() without return types