code: def setUp(self):
      self.x, self.y = tensor.scalars("x", "y")
      self.z = self.x + self.y
      self.w = 2 * self.z
  
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 1 for calling the TestEval obj's underlying member method code with example usage: obj.setUp() without return types