# File lib/ai4r/clusterers/k_means.rb, line 109
      def calculate_membership_clusters
        @clusters = Array.new(@number_of_clusters) do 
          Ai4r::Data::DataSet.new :data_labels => @data_set.data_labels
        end
        @data_set.data_items.each do |data_item|
          @clusters[eval(data_item)] << data_item
        end
      end