code: def dtype_combination(self, xp, dtype1, dtype2):
      x = testing.shaped_random((3, 4), xp, dtype1, scale=10, seed=0)
      y = testing.shaped_random((3, 4), xp, dtype2, scale=10, seed=1)
      return (x, y), {}
  
imports: import threading
  import unittest
  from unittest import mock
  import pytest
  import cupy
  from cupy import testing
  from cupy_tests.core_tests.fusion_tests import fusion_utils
label_desc: Use image node_id 2 for calling the FusionTestBase obj's underlying member method code with example usage: obj.dtype_combination(xp, dtype1, dtype2) and returns: x,  y,  dict