code: def _register_cuda_marker(config):
      config.addinivalue_line(
          "markers",
          "cuda(num=1): mark tests needing the specified number of NVIDIA GPUs.",
      )
  
imports: import pytest
  import chainerx.testing
  from chainerx_tests import cuda_utils
label_desc: Use image node_id 6 for calling a global function with example usage: _register_cuda_marker(config) without return types