code: def pytest_collection_modifyitems(config, items):
      if config.getoption("--run-slow"):
          return
      else:
          skip_slow = pytest.mark.skip(
              reason="need --runslow option to run"
          )
          for item in items:
              if "slow" in item.keywords:
                  item.add_marker(skip_slow)
  
imports: import pytest
  import tensorflow
label_desc: Use image node_id 3 for calling a global function with example usage: pytest_collection_modifyitems(config, items) without return types