In order to see what effect the new heterogeneous distance function has on accuracy, a homogeneous version
of the algorithm was implemented as well, which is exactly the same as HRBF, except that it uses a
normalized Euclidean distance function. This is accomplished by using normalized_diffa(x,y) instead of
normalized_vdma(x,y) in (6) for nominal as well as for numeric attributes. The homogeneous algorithm will
be referred to as the default algorithm, or simply RBF. Both algorithms used the same training sets and test
sets for each tria