code: def setUp(self):
      self.pred_masks = (np.array(mask) for mask in self.pred_masks)
      self.pred_labels = (np.array(label) for label in self.pred_labels)
      self.pred_scores = (np.array(score) for score in self.pred_scores)
      self.gt_masks = (np.array(mask) for mask in self.gt_masks)
      self.gt_labels = (np.array(label) for label in self.gt_labels)
  
file_path: chainercv/tests/evaluations_tests/test_eval_instance_segmentation_voc.py
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_instance_segmentation_voc_prec_rec
  from chainercv.evaluations import eval_instance_segmentation_voc
label_desc: Use image node_id 1 for calling the TestCalcInstanceSegmentationVOCPrecRec obj's underlying member method code with example usage: obj.setUp() without return types