scaler.py 文件源码

def tau_range(self, trange):
        """Return a scaled tau range.

        Tau scaling factor is the maximum tau value to avoid and empty solution
        (where all variables are discarded).
        The value is estimated on the maximum correlation between data and
        labels.

        Parameters
        ----------
        trange : :class:`numpy.ndarray`
            Tau range containing relative values (expected maximum is lesser
            than 1.0 and minimum greater than 0.0).

        Returns
        -------
        tau_range : :class:`numpy.ndarray`
            Scaled tau range.
        """
        if np.max(trange) >= 1.0 or np.min(trange) < 0.0:
            raise ValueError('Relative tau should be in [0,1)')
        if isinstance(trange, Sequence):
            trange = np.sort(trange)
        return trange * self.tau_scaling_factor