code: def test_avoid_upwards_branching_complex(abcde):
      r"""
           a1
           |
      e2   a2  d2  d3
      |    |    \  /
      e1   a3    d1
       \  /  \  /
        b1    c1
        |     |
        b2    c2
              |
              c3
  
      Prefer c1 over b1 because c1 will stay in memory less long while b1
      computes
      """
      a, b, c, d, e = abcde
      dsk = {
          (a, 1): (f, (a, 2)),
          (a, 2): (f, (a, 3)),
          (a, 3): (f, (b, 1), (c, 1)),
          (b, 1): (f, (b, 2)),
          (b, 2): (f,),
          (c, 1): (f, (c, 2)),
          (c, 2): (f, (c, 3)),
          (c, 3): (f,),
          (d, 1): (f, (c, 1)),
          (d, 2): (f, (d, 1)),
          (d, 3): (f, (d, 1)),
          (e, 1): (f, (b, 1)),
          (e, 2): (f, (e, 1)),
      }
  
      o = order(dsk)
      assert o[(c, 1)] < o[(b, 1)]
      assert abs(o[(d, 2)] - o[(d, 3)]) == 1
  
imports: import pytest
  from flash.core.serve.dag.order import ndependencies, order
  from flash.core.serve.dag.task import get, get_deps
  from flash.core.serve.dag.utils_test import add, inc
  from flash.core.utilities.imports import _TOPIC_SERVE_AVAILABLE
label_desc: Use image node_id 8 for calling a global function with example usage: test_avoid_upwards_branching_complex(abcde) without return types