H2O is an Open Source, Distributed, Fast & Scalable Machine Learning Platform: Deep Learning, Gradient Boosting (GBM) & XGBoost, Random Forest, Generalized Linear Modeling (GLM with Elastic Net), K-Means, PCA, Generalized Additive Models (GAM), RuleFit, Support Vector Machine (SVM), Stacked Ensembles, Automatic Machine Learning (AutoML), etc.
Right now, the h2o.appy call does not support all possible combination of h2o operators or axis. The test https://github.com/h2oai/h2o-3/blob/master/h2o-py/tests/testdir_misc/pyunit_apply.py shows the combination which are not support.
This jira subtasks lists all necessary bug fixes.