code: def test_mask_to_segm(self):
      segm = mask_to_segm(self.mask, self.bbox, self.segm_size)
      np.testing.assert_equal(segm, self.segm)
  
file_path: chainercv/tests/links_tests/model_tests/fpn_tests/test_mask_utils.py
imports: from __future__ import division
  import numpy
  import unittest
  from chainer import testing
  from chainercv.links.model.fpn.mask_utils import mask_to_segm
  from chainercv.links.model.fpn.mask_utils import segm_to_mask
label_desc: Use image node_id 3 for calling the TestMaskUtils obj's underlying member method code with example usage: obj.test_mask_to_segm() without return types