code: def test_complex(self):
      # Long test cases
      self.optimize_compare("acdf,jbje,gihb,hfac,gfac,gifabc,hfac")
      self.optimize_compare("acdf,jbje,gihb,hfac,gfac,gifabc,hfac")
      self.optimize_compare("cd,bdhe,aidb,hgca,gc,hgibcd,hgac")
      self.optimize_compare("abhe,hidj,jgba,hiab,gab")
      self.optimize_compare("bde,cdh,agdb,hica,ibd,hgicd,hiac")
      self.optimize_compare("chd,bde,agbc,hiad,hgc,hgi,hiad")
      self.optimize_compare("chd,bde,agbc,hiad,bdi,cgh,agdb")
      self.optimize_compare("bdhe,acad,hiab,agac,hibd")
  
imports: import functools
  import itertools
  from unittest import expectedFailure, skipIf, SkipTest
  import torch._numpy
  from pytest import raises
  from torch._numpy.testing import assert_, assert_allclose, assert_almost_equal, assert_array_equal, assert_equal, suppress_warnings
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, TestCase
label_desc: Use image node_id 27 for calling the TestEinsum obj's underlying member method code with example usage: obj.test_complex() without return types