code: def assert_dtype_not_equal(a, b):
      assert_(a != b)
      assert_(
          hash(a) != hash(b),
          "two different types hash to the same value !",
      )
  
imports: import functools
  import operator
  import pickle
  import sys
  import types
  from itertools import permutations
  from typing import Any
  from unittest import skipIf
  import pytest
  from pytest import raises
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, subtest, TEST_WITH_TORCHDYNAMO, TestCase, xpassIfTorchDynamo
  import numpy
label_desc: Use image node_id 2 for calling a global function with example usage: assert_dtype_not_equal(a, b) without return types