code: def setUp(self):
      self.link = Multibox(self.n_class, self.aspect_ratios)
  
      xs = []
      n_bbox = 0
      for ar in self.aspect_ratios:
          C, H, W = np.random.randint(1, 10, size=3)
          xs.append(
              np.random.uniform(size=(self.batchsize, C, H, W)).astype(
                  np.float32
              )
          )
          n_bbox += H * W * (len(ar) + 1) * 2
  
      self.xs = xs
      self.n_bbox = n_bbox
  
file_path: chainercv/tests/links_tests/model_tests/ssd_tests/test_multibox.py
imports: import numpy
  import unittest
  import chainer
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.ssd import Multibox
label_desc: Use image node_id 1 for calling the TestMultibox obj's underlying member method code with example usage: obj.setUp() without return types