code: def test_forward_zero_cpu(self):
      self._check_forward(np.zeros_like(self.x))
  
file_path: chainercv/tests/links_tests/model_tests/ssd_tests/test_normalize.py
imports: import numpy
  import unittest
  import chainer
  from chainer import initializers
  from chainer import testing
  from chainer.testing import attr
  from chainercv.links.model.ssd import Normalize
label_desc: Use image node_id 5 for calling the TestNormalize obj's underlying member method code with example usage: obj.test_forward_zero_cpu() without return types