code: def test_copy(self):
      another = self.distrib.copy()
      assert isinstance(
          another, distribution.SquashedGaussianDistribution
      )
      self.assertIsNot(self.distrib, another)
      self.assertIsNot(self.distrib.mean, another.mean)
      np.testing.assert_allclose(self.mean, another.mean.array)
      self.assertIsNot(self.distrib.var, another.var)
      np.testing.assert_allclose(self.var, another.var.array)
  
imports: import unittest
  import chainer
  from chainer import testing
  from chainer.testing import condition
  import numpy
  import scipy.stats
  from chainerrl import distribution
label_desc: Use image node_id 7 for calling the TestSquashedGaussianDistribution obj's underlying member method code with example usage: obj.test_copy() without return types