a qhestion about AI::Categorizer::KnowledgeSet

Dear all:
     I've got a problem of term weighting of text classification.
     The parameter of ftidf_weighting is used to set the term weighting for training data only.
     But, how do we set term weighting for a testing document? 
     shouldn't we assign testing data and training data the same weighting method?
     For example: decide to set tf*idf for term weighting. we can use 
     
        my $k = new AI::Categorizer::KnowledgeSet(ftidf_weighting => 'tfx' );
 
     for training data.
     However, I do not know hoe to use the same set 'tfx' for a new document or a document collection.   
     Please give me some advice!
     Thanks!



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