code: def process_graph(
      self, inputs, outputs, updates=None, display_inputs=False
  ):
      if updates is None:
          updates = {}
      if not isinstance(inputs, (list, tuple)):
          inputs = [inputs]
      if not isinstance(outputs, (list, tuple)):
          outputs = [outputs]
      current = None
      if display_inputs:
          strings = [
              (
                  0,
                  "inputs: "
                  + ", ".join(map(str, list(inputs) + updates.keys())),
              )
          ]
      else:
          strings = []
      pprinter = self.clone_assign(
          lambda pstate, r: r.name is not None and r is not current,
          leaf_printer,
      )
      inv_updates = dict((b, a) for (a, b) in iteritems(updates))
      i = 1
      for node in gof.graph.io_toposort(
          list(inputs) + updates.keys(),
          list(outputs) + updates.values(),
      ):
          for output in node.outputs:
              if output in inv_updates:
                  name = str(inv_updates[output])
                  strings.append(
                      (
                          i + 1000,
                          "%s <- %s" % (name, pprinter.process(output)),
                      )
                  )
                  i += 1
              if output.name is not None or output in outputs:
                  if output.name is None:
                      name = "out[%i]" % outputs.index(output)
                  else:
                      name = output.name
                  # backport
                  # name = 'out[%i]' % outputs.index(output) if output.name
                  #  is None else output.name
                  current = output
                  try:
                      idx = 2000 + outputs.index(output)
                  except ValueError:
                      idx = i
                  if len(outputs) == 1 and outputs[0] is output:
                      strings.append(
                          (idx, "return %s" % pprinter.process(output))
                      )
                  else:
                      strings.append(
                          (
                              idx,
                              "%s = %s"
                              % (name, pprinter.process(output)),
                          )
                      )
                  i += 1
      strings.sort()
      return "\n".join(s[1] for s in strings)
  
imports: from __future__ import absolute_import, print_function, division
  from copy import copy
  import logging
  import os
  import sys
  import hashlib
  import numpy
  from six import string_types, integer_types, iteritems
  from six.moves import StringIO, reduce
  import theano
  from theano import gof
  from theano import config
  from theano.gof import Op, Apply
  from theano.compile import Function, debugmode, SharedVariable
label_desc: Use image node_id 6 for calling the PPrinter obj's underlying member method code with example usage: obj.process_graph(inputs, outputs, updates, display_inputs) and returns: str