Thanks, I'll give number three a try :-) Is there an example with two planning entities?
Regards, Mats 1 dec 2013 kl. 10:58 skrev Geoffrey De Smet <ge0ffrey.s...@gmail.com>: > > On 30-11-13 15:02, Mats Norén wrote: >> Hi, >> I'm looking for an example that does both scheduling and vrp. > No example of that combination yet. >> I have workers with certain skills and I have goods (which require a >> particular skill set) to be delivered or picked up within certain time >> windows. >> Each worker work in a team. >> The team should if possible be assigned to the same delivery/pickup. >> The workers work in shifts and by law has to have breaks etc. >> I want to create a schedule that assigns workers/teams to deliveries/pickups >> and stay within the time windows as well as optimizing the distance >> travelled. >> I thought about the nurse rostering example together with cvrptw but the >> nurse rostering uses shifts (day, night). >> >> Do I have to do it in two steps? First VRP and then try to assign the >> workers? > In practice, I often see this happening in 2 separate, sequential > planning problems (or phases), > but that's just because of Conway's law: > "organizations which design systems ... are constrained to produce > designs which are copies of the communication structures of these > organizations" > > 2 phases is probably suboptimal, because the limitations on the second > phase influence the planning of the first phase. > There are 3 ways to handle that: > > 1) Ignore it that 2 phases is suboptimal. You 'll have better results > that the old system already. You can tweak it by adding some constraints > in phase 1 that make it easier for phase 2. > > 2) Bender's decomposition. Basically ping-pong between phase 1 and phase > 2 (where the result of phase 2 adds constraints in phase 1). Not yet > supported out-of-the-box by OptaPlanner, but probably a domain specific > pita to implement. > > 3) Do it all in 1 phase. OptaPlanner 6 has been written to handle > multiple planning entity classes and multiple planning variables, so > it's definitely possible. You 'll like need to add course grained moves > to get things to change for phase 1 in a way that works for phase 2, to > avoid getting stuck in a "score trap" (see docs). > > I am a strong believer in approach 3). If you go that way, let me know > how it works out: I need cases to prove that the human planners that > follow Conway's law should not limit our potential when automating this. > But the conservative choice is 1). > > In any case, I recommend to prototype phase 1 first. > >> >> The only hard facts are the workers worktime and the goods delivery/pickup >> time. >> >> Any suggestions? >> >> Best regards, >> Mats >> _______________________________________________ >> rules-users mailing list >> rules-users@lists.jboss.org >> https://lists.jboss.org/mailman/listinfo/rules-users > > _______________________________________________ > rules-users mailing list > rules-users@lists.jboss.org > https://lists.jboss.org/mailman/listinfo/rules-users _______________________________________________ rules-users mailing list rules-users@lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users
