code: def setUp(self):
      self.link = DummySSD(n_fg_class=self.n_fg_class)
      self.n_bbox = 10 * 10 * 4 + 4 * 4 * 6 + 1 * 1 * 4
  
imports: import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.ssd import Multibox
  from chainercv.links.model.ssd import SSD
  from chainercv.utils import assert_is_detection_link
label_desc: Use image node_id 1 for calling the TestSSD obj's underlying member method code with example usage: obj.setUp() without return types