使用按行值分组的proc optnet

Question

我正在尝试在数据集上使用proc optnet，如下所示：

CITY_NAME   from    LAT        LON      to  LAT1        LON1        weight
City_1        1  42,40393   69,875266   2   42,430774   69,857084   3,336327596
City_2        1  43,661035  51,152165   2   43,683002   51,178324   3,22605013
City_3        1  43,661035  51,152165   3   43,650012   51,151761   1,225149669

并在同一代码中为每个CITY_NAME使用proc optnet，类似“分组依据”

   data clusters;
set WORK._DATASET_WITH_CITYNAME_;
    proc optnet
   loglevel   = moderate
   data_links = WORK._DATASET_WITH_CITYNAME_
   out_nodes  = NodeSetOut4;
   tsp
     /*out      = TSPTour*/;
     ods noresults; 

run;
%put &_OROPTNET_;
%put &_OROPTNET_TSP_;
run;

结果，我得到了一种最佳的方式来访问整个数据集，而不是除以CITY_NAME

如何获取按CITY_NAME值分组的optnet？