code: def test_rop(self):
      T = theano.tensor
  
      x = T.vector()
      v = T.vector()
      y = gradient.zero_grad(x)
  
      rop = T.Rop(y, x, v)
      f = theano.function([x, v], rop, on_unused_input="ignore")
  
      a = np.asarray(self.rng.randn(5), dtype=config.floatX)
      u = np.asarray(self.rng.randn(5), dtype=config.floatX)
  
      assert np.count_nonzero(f(a, u)) == 0
  
imports: from __future__ import absolute_import, print_function, division
  from collections import OrderedDict
  import unittest
  import numpy
  from six.moves import xrange
  import theano
  from theano import gof, change_flags
  from theano.compat import izip
  from theano.tests import unittest_tools
  from theano import gradient
  from theano import config
  from theano.gof.null_type import NullType
  from theano.sandbox.rng_mrg import MRG_RandomStreams
label_desc: Use image node_id 4 for calling the TestZeroGrad obj's underlying member method code with example usage: obj.test_rop() without return types