code: def test_out_is_res(self):
      a = np.arange(9).reshape(3, 3)
      res = np.einsum("...ij,...jk->...ik", a, a, out=a)
      assert res is a
  
imports: import itertools
  import sys
  import platform
  import pytest
  import numpy
  from numpy.testing import assert_, assert_equal, assert_array_equal, assert_almost_equal, assert_raises, suppress_warnings, assert_raises_regex, assert_allclose
label_desc: Use image node_id 31 for calling the TestEinsum obj's underlying member method code with example usage: obj.test_out_is_res() without return types