code: def test_graph_replace(self):
      x = MyVariable("x")
      y = MyVariable("y")
      z = MyVariable("z")
      w = MyVariable("w")
      MyOp("zop")(z)
      x2 = MyOp("xop")(x, w)
      x2.name = "x2"
      y2 = MyOp("yop")(y)
      y2.name = "y2"
  
      yc = graph_replace([x2], {x: y2})[0]
      assert yc.owner.inputs[0] is y2
      # the old reference is kept
      assert yc.owner.inputs[1] is w
  
      # test replace itself
      yc = graph_replace([x2], {x2: y2})[0]
      assert yc is y2
      assert yc.owner.inputs[0] is y
      assert len(yc.owner.inputs) == 1
  
      # the case where inputs have to be replaced in reverse topological order
      o = MyOp("xyop")(x2, y2)
      new_x = x.clone(name="x_new")
      new_y2 = y2.clone(name="y2_new")
  
      oc = graph_replace([o], {x: new_x, y2: new_y2})[0]
      assert oc.owner.inputs[1] is new_y2
      assert oc.owner.inputs[0].owner.inputs[0] is new_x
      # the old reference is still kept
      assert oc.owner.inputs[0].owner.inputs[1] is w
  
imports: import numpy
  import pytest
  import scipy.special
  import pytensor.tensor
  from pytensor import config, function, shared
  from pytensor.graph.basic import equal_computations, graph_inputs
  from pytensor.graph.replace import clone_replace, graph_replace, vectorize_graph, vectorize_node
  from pytensor.tensor import dvector, fvector, vector
  from tests import unittest_tools
  from tests.graph.utils import MyOp, MyVariable, op_multiple_outputs
label_desc: Use image node_id 1 for calling the TestGraphReplace obj's underlying member method code with example usage: obj.test_graph_replace() without return types