def distribution(self):
        """
        Distribution function

        One of: ``"auto"``, ``"bernoulli"``, ``"multinomial"``, ``"gaussian"``, ``"poisson"``, ``"gamma"``,
        ``"tweedie"``, ``"laplace"``, ``"quantile"``, ``"huber"``  (default: ``"auto"``).
        """
        return self._parms.get("distribution")