Minor Description
Many datasets exist in LibSVM format for regression tasks [1] but currently the loadLibSVMFile primitive doesn't handle regression datasets.
More precisely, the LabelParser is either a MulticlassLabelParser or a BinaryLabelParser. What happens then is that the file is loaded but in multiclass mode : each target value is interpreted as a class name !
The fix would be to write a RegressionLabelParser which converts target values to Double and plug it into the loadLibSVMFile routine.
[1] http://www.csie.ntu.edu.tw/~cjlin/libsvmtools/datasets/regression.html
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