def __init__(self, alpha=0.95, tie_method='Efron', normalize=True, penalizer=0.0):
        if not (alpha <= 1. < 0):
            raise ValueError('alpha parameter must be between 0 and 1.')
        if penalizer < 0:
            raise ValueError("penalizer parameter must be >= 0.")
        if tie_method != 'Efron':
            raise NotImplementedError("Only Efron is available atm.")

        self.alpha = alpha
        self.normalize = normalize
        self.tie_method = tie_method
        self.penalizer = penalizer
        self.strata = None
dataset/ETHPy150Open CamDavidsonPilon/lifelines/lifelines/fitters/coxph_fitter.py/CoxPHFitter.__init__/swapped operands of `<`