code: def tearDown(self):
      if self.old_settings is not None:
          numpy.seterr(**self.old_settings)
  
imports: import unittest
  import numpy
  from chainer import backend
  from chainer.backends import cuda
  from chainer import distributions
  from chainer import gradient_check
  from chainer import testing
  from chainer.testing import attr
label_desc: Use image node_id 2 for calling the TestBernoulli obj's underlying member method code with example usage: obj.tearDown() without return types