code: def test_gaussian_kl_divergence_gpu(self):
      self.check_gaussian_kl_divergence(
          cuda.to_gpu(self.mean), cuda.to_gpu(self.ln_var)
      )
  
imports: import unittest
  import numpy
  import chainer
  from chainer.backends import cuda
  from chainer import functions
  from chainer import testing
  from chainer.testing import attr
  from chainer.testing import condition
label_desc: Use image node_id 4 for calling the TestGaussianKLDivergence obj's underlying member method code with example usage: obj.test_gaussian_kl_divergence_gpu() without return types