Optionnal method if you chose not to set inputs on init

        Parameters
        ----------
        data: np.array
            Input data. Provide either phase or frequency (fractional,
            adimensional)
        rate: float
            The sampling rate for data, in Hz. Defaults to 1.0
        data_type: {'phase', 'freq'}
            Data type, i.e. phase or frequency. Defaults to "phase".
        taus: np.array
            Array of tau values, in seconds, for which to compute statistic.
            Optionally set taus=["all"|"octave"|"decade"] for automatic

def set_input(self, data,
                  rate=1.0, data_type="phase", taus=None):
        """ Optionnal method if you chose not to set inputs on init

        Parameters
        ----------
        data: np.array
            Input data. Provide either phase or frequency (fractional,
            adimensional)
        rate: float
            The sampling rate for data, in Hz. Defaults to 1.0
        data_type: {'phase', 'freq'}
            Data type, i.e. phase or frequency. Defaults to "phase".
        taus: np.array
            Array of tau values, in seconds, for which to compute statistic.
            Optionally set taus=["all"|"octave"|"decade"] for automatic
        """
        self.inp["data"] = data
        self.inp["rate"] = rate
        self.inp["data_type"] = data_type
        self.inp["taus"] = taus