[shogun] Problem with precomputed kernels and cv

[Tobias Sterbak]

Hi everyone,

 

I have some precomputed kernel matrices and want to use them in a mkl-setup.
That means there are no features (or I don't want to use them). 

I create a combined kernel and append these matrices. Then set the kernels
for the mklClassifier. 

Then I want to use cross-validation

splitting_strategy=StratifiedCrossValidationSplitting(labels, 5)

evaluation_criterium=ContingencyTableEvaluation(ACCURACY)

cross_validation=CrossValidation(mkl, labels, splitting_strategy,
evaluation_criterium)

 

This works so far. But when I now want to get the result

result=cross_validation.evaluate()

Then I get this error

SystemError: [ERROR] In file
/shogun-4.0.0/src/shogun/evaluation/CrossValidation.cpp line 76:
CrossValidation::evaluate() is only possible if features are attached

 

So cross validation is not possible without features?

 

I hope you can help me.

 

Best regards,

Tobias