GBOP2_maxP_TE           PSOGO: Power maximizing design with efficacy
                        and toxicity boundaries
GBOP2_maxP_dualE        PSOGO: Power maximizing design with dual
                        boundaries
GBOP2_maxP_singleE      PSOGO: Power maximizing design with single
                        boundary for futility
GBOP2_minSS_TE          PSOGO: Optimal/Minimax design with efficacy and
                        toxicity boundaries
GBOP2_minSS_dualE       PSOGO: Optimal/Minimax design with dual
                        boundaries
GBOP2_minSS_singleE     PSOGO: Optimal/Minimax design with single
                        boundary for futility
get_cluster             Get current cluster
init_cluster            Initialize parallel cluster
stop_cluster            Stop and clean up the cluster
summary.gbop2           Summary function Summary function for gbop2
                        objects
