code: def test_calls_cpu(self):
      self._test_calls(numpy)
  
imports: import unittest
  import chainer
  from chainer import cuda
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
  import numpy
  from chainerrl.links import noisy_linear
label_desc: Use image node_id 3 for calling the TestFactorizedNoisyLinear obj's underlying member method code with example usage: obj.test_calls_cpu() without return types