code: def test_parallel_fold(self):
      g = hl.Graph()
      a = hl.Node(uid="a", name="a", op="a")
      b = hl.Node(uid="b", name="b", op="b")
      c = hl.Node(uid="c", name="c", op="c")
      d = hl.Node(uid="d", name="d", op="d")
      e = hl.Node(uid="e", name="e", op="e")
      g.add_node(a)
      g.add_node(b)
      g.add_node(c)
      g.add_node(d)
      g.add_node(e)
      g.add_edge(a, b)
      g.add_edge(b, c)
      g.add_edge(a, d)
      g.add_edge(c, e)
      g.add_edge(d, e)
  
      t = ht.Fold("((b > c) | d) > e", "bcde")
      g = t.apply(g)
      self.assertEqual(g.outgoing(g["a"])[0].op, "bcde")
  
imports: import unittest
  import hiddenlayer
  import hiddenlayer.ge
  import hiddenlayer.transforms
label_desc: Use image node_id 4 for calling the TestTransforms obj's underlying member method code with example usage: obj.test_parallel_fold() without return types