code: def insert_cluster(self, cluster):
          
          
          entry = cfentry(len(cluster), linear_sum(cluster), square_sum(cluster));
          self.insert(entry);
docs: !
          @brief Insert cluster that is represented as list of points where each point is represented by list of coordinates.
          @details Clustering feature is created for that cluster and inserted to the tree.
          
          @param[in] cluster (list): Cluster that is represented by list of points that should be inserted to the tree.