code: def test_lexsort():
      keys = [torch.randn(100) for _ in range(3)]
  
      expected = np.lexsort([key.numpy() for key in keys])
      assert torch.equal(lexsort(keys), torch.from_numpy(expected))
  
label_desc: Use image node_id 1 for calling a global function with example usage: test_lexsort() without return types