orer name -> float
        Score on testing set (for all the scorers).
    n_test_samples : int
        Number of test samples.
    fit_time : float
        Time spent for fitting in seconds.
    score_time : float
        Time spent for scoring in seconds.
    parameters : dict or None
        The parameters that have been evaluated.
    estimator : estimator object
        The fitted estimator.
    fit_error : str or None
        Traceback str if the fit failed, None if the fit succeeded.
)