# File lib/classifier/bayes.rb, line 41
        def untrain(category, text)
                category = category.prepare_category_name
                text.word_hash.each do |word, count|
                        if @total_words >= 0
                                orig = @categories[category][word]
                                @categories[category][word]     ||=     0
                                @categories[category][word]      -=     count
                                if @categories[category][word] <= 0
                                        @categories[category].delete(word)
                                        count = orig
                                end
                                @total_words -= count
                        end
                end
        end