code: def test_einsum_fixedstridebug(self):
      # Issue #4485 obscure einsum bug
      # This case revealed a bug in nditer where it reported a stride
      # as 'fixed' (0) when it was in fact not fixed during processing
      # (0 or 4). The reason for the bug was that the check for a fixed
      # stride was using the information from the 2D inner loop reuse
      # to restrict the iteration dimensions it had to validate to be
      # the same, but that 2D inner loop reuse logic is only triggered
      # during the buffer copying step, and hence it was invalid to
      # rely on those values. The fix is to check all the dimensions
      # of the stride in question, which in the test case reveals that
      # the stride is not fixed.
      #
      # NOTE: This test is triggered by the fact that the default buffersize,
      #       used by einsum, is 8192, and 3*2731 = 8193, is larger than that
      #       and results in a mismatch between the buffering and the
      #       striding for operand A.
      A = np.arange(2 * 3).reshape(2, 3).astype(np.float32)
      B = np.arange(2 * 3 * 2731).reshape(2, 3, 2731).astype(np.int16)
      es = np.einsum("cl, cpx->lpx", A, B)
      tp = np.tensordot(A, B, axes=(0, 0))
      assert_equal(es, tp)
      # The following is the original test case from the bug report,
      # made repeatable by changing random arrays to aranges.
      A = np.arange(3 * 3).reshape(3, 3).astype(np.float64)
      B = (
          np.arange(3 * 3 * 64 * 64)
          .reshape(3, 3, 64, 64)
          .astype(np.float32)
      )
      es = np.einsum("cl, cpxy->lpxy", A, B)
      tp = np.tensordot(A, B, axes=(0, 0))
      assert_equal(es, tp)
  
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 17 for calling the TestEinsum obj's underlying member method code with example usage: obj.test_einsum_fixedstridebug() without return types