SL.glmnet.extra         SuperLearner wrapper for cv.glmnet that works
                        with the extra families
binomial_extra          Family object for fitting binomial (e.g.,
                        logistic, probit) regression model with
                        potentially unbounded continuous outcome
poisson_extra           Family object for fitting log-linear model with
                        potentially unbounded continuous outcome,
                        particularly with Poisson working likelihood
screen.glmnet.extra     SuperLearner screener using cv.glmnet that
                        works with the extra families
