def most_dense_cluster(clusters = @clusters)
      max_density = 0
      max_density_cluster = 0

      nil if clusters.nil?

      clusters.each_with_index do |item, i|
        if item.density > max_density
          max_density = item.density
          max_density_cluster = i
        end
      end
      clusters[max_density_cluster]
    end
def most_dense_cluster(clusters = @clusters)
      max_density = 0
      max_density_cluster = 0

      nil if clusters.nil?

      clusters.each_with_index do |item, i|
        if item.density > max_density
          max_density = item.density
          max_density_cluster = i
        end
      end
      clusters[max_density_cluster]
    end
Returns the cluster with the maimum density
 Params:
 +clusters+: list of +Clususter+ objects