Weka PLS for classification does not work

[gdrakakis]

Eternally Queued

[hampos]

@gdrakakis : The task is not eternally queued, it is progressing and then going to Error state but the UI is not refreshing.

@AValsamis : This is a problem for all weka algorithms that support classification. There are 2 things that need fixing to resolve this.

1. The code that converts a Dataset to Weka Instances goes like this:
   instance.setValue(data.attribute(entry.getKey()), Double.parseDouble(entry.getValue().toString()));
   It tries to ignore the value's type and parse it to Double. This obviously will not work for classification.
   You can find it here: https://github.com/KinkyDesign/JaqpotQuattro/blob/development/JaqpotAlgorithmServices/src/main/java/org/jaqpot/algorithm/weka/InstanceUtils.java#L72
2. Each algorithm that supports either Regression or Classification must be registered 2 times with different algorithm ids. This will give us the ability to modify it's parameters and in the 1st case allow only parameters that are valid for Regression, and on the 2nd case parameters valid for Classification.
   For example, LibSVM algorithm's type parameter can take either of those values:
   NU_SVR, EPSILON_SVR
   NU_SVC, C_SVC, ONE_CLASS_SVM
   The first 2 will try to do Regression, while the other 3 will do Classification.
   So, weka-svm-regression will have allowedValues the first 2 on type parameter, while weka-svm-classification will have the other 3.

For now I will remove weka-pls from classification.