code: def perform(self, node, inputs, output_storage):
      x, y = inputs
      z1, z2 = output_storage
      z1[0] = x + y
      z2[0] = x - y
  
imports: from __future__ import absolute_import, print_function, division
  import unittest
  import theano
  import numpy
  from theano.gof import Op, Apply
  from theano import tensor, function, printing
  from theano.tests import unittest_tools
  import theano
  import numpy
  from theano.compile.ops import as_op
label_desc: Use image node_id 5 for calling the SumDiffOp obj's underlying member method code with example usage: obj.perform(node, inputs, output_storage) without return types