Stacked Regression Model

This stacked regression model is modified from the stacked classifier by Dmitry Pechyony: https://gallery.cortanaintelligence.com/Experiment/Building-Ensemble-of-Classifiers-using-Stacking-2. This model has been used for the hackathon: http://gridclub.io/Hack2O/. In the left part, there is one stacked model ensembled from four basic regression models. In the right part, there are four independent regression models for comparision.