code: def test_copy_multigpu_peer(self, dtype):
      if cuda.runtime.deviceCanAccessPeer(0, 1) != 1:
          pytest.skip("peer access is unavailable")
      with pytest.warns(cupy._util.PerformanceWarning):
          self.check_copy(dtype, 0, 1)
  
imports: import unittest
  import numpy
  import pytest
  import cupy
  from cupy import _core
  from cupy import cuda
  from cupy import testing
label_desc: Use image node_id 4 for calling the TestElementwise obj's underlying member method code with example usage: obj.test_copy_multigpu_peer(dtype) without return types