How to use the xskillscore.crps_ensemble function in xskillscore

| **orientation** | negative  |
        +-----------------+-----------+

    Reference:
        * Matheson, James E., and Robert L. Winkler. “Scoring Rules for
          Continuous Probability Distributions.” Management Science 22, no. 10
          (June 1, 1976): 1087–96. https://doi.org/10/cwwt4g.
        * https://www.lokad.com/continuous-ranked-probability-score

    See also:
        * properscoring.crps_ensemble
        * xskillscore.crps_ensemble
    """
    weights = metric_kwargs.get('weights', None)
    # switch positions because xskillscore.crps_ensemble(verif, forecasts)
    return crps_ensemble(verif, forecast, weights=weights)