5. A method according to claim 1 further comprising: selecting, for all groups of corresponding data models, a group of corresponding class dependent data models or the corresponding independent data model based on a fit comparison and adding a selected data model or models to the final data model.
7. A method according to claim 5 wherein the cross entropy of the corresponding class dependent data models and the training data is calculated by calculating a logarithm likelihood of combined corresponding class dependent data models with regards to the training data.