R package h2oEnsemble: H2O Ensemble Learning. The h2oEnsemble R package provides functionality to create ensembles from the base learning algorithms that are accessible via the h2o R package (H2O version 3.0 and above). This type of ensemble learning is called ”super learning”, ”stacked regression” or ”stacking.” The Super Learner algorithm learns the optimal combination of the base learner fits. In a 2007 article titled, ”Super Learner,” it was shown that the super learner ensemble represents an asymptotically optimal system for learning.