Setting MultiSearch and Understanding GridSearch Outputs

Hello everyone,

I've been struggling to understand the MultiSearch and GridSearch tools and I desperately need some help.  I'm doing everything through the GUI 
interface. 

More specifically, I don't know how I could wrap my classifier into the Search since I would like to use a filtered classifier (C4.5 with AttributeSelectionClassifier + ClassBalancer).  I know I can choose the classifier "Filtered Classifier" when setting GridSearch but I don't know how I could refer the J48 parameters to the X and Y properties then. Another issue is that ClassBalancer must be the last filter to be applied because AttributeSelectionClassifier does not handle doubled instances as far as I understood.

I don't know either if it is possible to wrap everything into the MultiSearch to include filter parameters into the search and how I would do that.  I didn't understand the MultiSearch setting at all, to be honest. 

Moreover, I don't quite understand the outputs of GridSearch in the Explorer. Where can I see which were the best parameters chosen? 

If any of you could shed any light on these issues, it would help me a lot. Thanks in advance. 

Cheers, Olavo.
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