code: def inputs():
      x = MyVariable("x")
      y = MyVariable("y")
      z = MyVariable("z")
      return x, y, z
  
imports: from __future__ import absolute_import, print_function, division
  from theano.gof.graph import Variable, Apply
  from theano.gof.type import Type
  from theano.gof.op import Op
  from theano.gof.fg import FunctionGraph
  from theano.gof.toolbox import NodeFinder
label_desc: Use image node_id 3 for calling a global function with example usage: inputs() and returns: x,  y,  z