code: def setUp(self):
      self.link = DummyLightHeadRCNN(
          n_anchor_base=1,
          feat_stride=16,
          n_fg_class=21,
          n_roi=1,
          min_size=self.min_size,
          max_size=self.max_size,
          loc_normalize_mean=(0.0, 0.0, 0.0, 0.0),
          loc_normalize_std=(0.1, 0.1, 0.2, 0.2),
      )
  
imports: import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.light_head_rcnn import LightHeadRCNN
  from chainercv.utils import assert_is_detection_link
  from chainercv.utils import generate_random_bbox
label_desc: Use image node_id 1 for calling the TestLightHeadRCNNPrepare obj's underlying member method code with example usage: obj.setUp() without return types