Fig. 1

An example with three constructed regression trees with six features \(x_{i,1}\) to \(x_{i,6}\) used as splitting points at each branch, and leaf node values. Also shown is the computation of \(f({\mathbf {x}}_i)\) given an example of feature values \({\mathbf {x}}_i\). The structure of the trees opens the possibility to explore interactions since a path from a root node to a leaf node denotes a combination of feature values