code: def test_copy(self):
      x = torch.randn(1, device="cuda:1")
  
      # We should have only created context on 'cuda:1'
      self.assertFalse(torch._C._cuda_hasPrimaryContext(0))
      self.assertTrue(torch._C._cuda_hasPrimaryContext(1))
  
      y = torch.randn(1, device="cpu")
      y.copy_(x)
  
      # We should still have only created context on 'cuda:1'
      self.assertFalse(torch._C._cuda_hasPrimaryContext(0))
      self.assertTrue(torch._C._cuda_hasPrimaryContext(1))
  
file_path: pytorch/test/test_cuda_primary_ctx.py
imports: import torch
  from torch.testing._internal.common_utils import TestCase, run_tests, skipIfRocmVersionLessThan, NoTest
  from torch.testing._internal.common_cuda import TEST_CUDA, TEST_MULTIGPU
  import sys
  import unittest
label_desc: Use image node_id 3 for calling the TestCudaPrimaryCtx obj's underlying member method code with example usage: obj.test_copy() without return types