code: def setUp(self):
      self.pred_bboxes = np.array([[[0, 0, 10, 10], [0, 0, 20, 20]]])
      self.pred_labels = np.array([[1, 2]])
      self.pred_scores = np.array([[0.8, 0.9]])
      self.gt_bboxes = np.array([[[0, 0, 10, 9]]])
      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_detection_coco
label_desc: Use image node_id 1 for calling the TestEvalDetectionCOCOSomeClassNonExistent obj's underlying member method code with example usage: obj.setUp() without return types