def _find_alphas_param(self):
        """
        Searches for the parameter on the estimator that contains the array of
        alphas that was used to produce the error selection. If it cannot find
        the parameter then a YellowbrickValueError is raised.
        """

        # NOTE: The order of the search is very important!
        for attr in ("cv_alphas_", "alphas_", "alphas",):
            try:
                return getattr(self.estimator, attr)
            except AttributeError:
                continue

        raise YellowbrickValueError(
            "could not find alphas param on {} estimator".format(
                self.estimator.__class__.__name__
            )
        )