code: def test_5(self):
      # Test when outputs have clients
      r1, r2, r4 = MyVariable(1), MyVariable(2), MyVariable(4)
      o0 = MyOp.make_node(r1, r2)
      MyOp.make_node(o0.outputs[0], r4)
      all = io_toposort([], o0.outputs)
      assert all == [o0]
  
imports: from __future__ import absolute_import, print_function, division
  from itertools import count
  import pickle
  import unittest
  from nose.plugins.skip import SkipTest
  import numpy
  from theano import sparse, shared, tensor
  from theano.gof.graph import Apply, as_string, clone, general_toposort, inputs, io_toposort, is_same_graph, Variable
  from theano.gof.op import Op
  from theano.gof.type import Type
label_desc: Use image node_id 6 for calling the TestToposort obj's underlying member method code with example usage: obj.test_5() without return types