code: def test_initialize_cpu(self):
      self.link(numpy.zeros(self.shape, dtype=self.lowprec_dtype))
  
      testing.assert_allclose(
          numpy.ones(self.size), self.link.gamma.data
      )
      self.assertEqual(self.link.gamma.dtype, self.highprec_dtype)
  
      testing.assert_allclose(
          numpy.zeros(self.size), self.link.beta.data
      )
      self.assertEqual(self.link.beta.dtype, self.highprec_dtype)
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import links
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 2 for calling the TestDefaultInitializer obj's underlying member method code with example usage: obj.test_initialize_cpu() without return types