code: def test_entropy(self):
      with self.assertRaises(NotImplementedError):
          self.distrib.entropy
  
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 5 for calling the TestSquashedGaussianDistribution obj's underlying member method code with example usage: obj.test_entropy() without return types