code: def _get_parallel_test_fixtures(naming="estimator"):
      """Return fixtures for parallelization tests.
  
      Returns a list of parameter fixtures, where each fixture
      is a dict with keys "backend" and "backend_params".
  
      Parameters
      ----------
      naming : str, optional
          naming convention for the parameters, one of
  
          "estimator": for use in estimator constructors,
          ``backend`` and ``backend_params``
          "config": for use in ``set_config``,
          ``backend:parallel`` and ``backend:parallel:params``
  
      Returns
      -------
      fixtures : list of dict
          list of backend parameter fixtures
          keys depend on ``naming`` parameter, see above
          either ``backend`` and ``backend_params`` (``naming="estimator"``),
          or ``backend:parallel`` and ``backend:parallel:params`` (``naming="config"``)
          values are backend strings and backend parameter dicts
          only backends that are available in the environment are included
      """
      from sktime.utils.validation._dependencies import (
          _check_soft_dependencies,
      )
  
      fixtures = []
  
      # test no parallelization
      fixtures.append({"backend": "None", "backend_params": {}})
  
      # test joblib backends
      for backend in ["loky", "multiprocessing", "threading"]:
          fixtures.append({"backend": backend, "backend_params": {}})
          fixtures.append(
              {"backend": backend, "backend_params": {"n_jobs": 2}}
          )
          fixtures.append(
              {"backend": backend, "backend_params": {"n_jobs": -1}}
          )
  
      # test dask backends
      if _check_soft_dependencies("dask", severity="none"):
          fixtures.append({"backend": "dask", "backend_params": {}})
          fixtures.append(
              {
                  "backend": "dask",
                  "backend_params": {"scheduler": "sync"},
              }
          )
  
      return fixtures
  
label_desc: Use image node_id 5 for calling a global function with example usage: _get_parallel_test_fixtures(naming) and returns: fixtures