code: def test_empty(self):
      a, edge1, edge2 = histogram2d([], [], bins=([0, 1], [0, 1]))
      # assert_array_max_ulp(a, array([[0.]]))
      assert_allclose(a, np.array([[0.0]]), atol=1e-15)
  
      a, edge1, edge2 = histogram2d([], [], bins=4)
      # assert_array_max_ulp(a, np.zeros((4, 4)))
      assert_allclose(a, np.zeros((4, 4)), atol=1e-15)
  
imports: import functools
  from unittest import expectedFailure, skipIf
  import pytest
  from pytest import raises
  from torch.testing._internal.common_utils import instantiate_parametrized_tests, parametrize, run_tests, TEST_WITH_TORCHDYNAMO, TestCase, xpassIfTorchDynamo
label_desc: Use image node_id 5 for calling the TestHistogram2d obj's underlying member method code with example usage: obj.test_empty() without return types