Parses the testing file, checking that all declarations are coherent with those already loaded from the training
Arff file; if the classes are unknown, it reads only the instances, without looking for the classes.
Take a raw set of data (undiscretized features) and put them into
a dataset to be accessed by classifiers; categorical variables are copied unchanged, while
numerical variables are converted to categorical according to DiscretizationIntervals;
numerical variables discretized into a unique bin (and hence listed
in NonUsedFeatures) are discarded.