List of official acronyms for our machine learning algorithms

For the moment you can instantiate a MachineLearning class with one of the following identifiers :
'knn', 'nn', 'dtw', 'gmm', 'gmr', 'hhmm', 'hhmr'.
Are we good with these ?
Even if it's not the most self-explanatory list ever, I think we need such a list to use as internal variables, write factories or whatever in a consistent way.
'gvf' should be added and maybe 'gmr' and 'hhmr' removed (because they only depend on the training set they're given)