vehicle routing problem: how to solve it in java?
TRANSCRIPT
VehicleRoutingProblem:howtosolveitinJava?
ByStanislavKyfenko
StanislavKyfenko• TechnicalLeadatSoftServe• SoftwareengineermainlyfocusedondistributedsystemsdevelopmentandVRPsolutions
https://ua.linkedin.com/in/skyfenko
Agenda
• WhatisVRP?• VRPcharacteristicsandgoals• VRPtypes:fromsimplicitytocomplexity• OptaPlanner andjsprit• Q&A
WhatdoesVRPstandfor?
• VRPisoneofthemostpopularconstraintsatisfactionproblemsintheareasoftransportation,deliveryandlogistics• ThemainpurposeistodesignatleastonerouteforKvehicleswithLcapacityeachtodelivergoodsfromMdepotstoNcustomersinordertomeetthegivenconstraintsandtimewindows.• Effectiveutilizationofresources(vehicles)candecreasetransportationcostssignificantly
VRPcharacteristics
Depot
TimeWindows
Location
Customer
TimeWindows
Location Accessibility
Demands
Vehicle
TimeWindows Returntodepot
Capacity Driverrestperiod
Route
Totalelapsedtime Timedelays
TotaldistanceTotalcost
VRPgoals
Totalelapsedtime Totaldistance Totalcost
Totalconsumedfuel Fleetofvehicles
VRPgoals
Totalprofit Customershappiness
VehicleRoutingProblemtypes
1.TravellingSalesmanProblem
Thesimplestone- TSP
2.CapacitatedVRP
CapacitatedVRP
3.VRPwithmultipledepots
VRPwithmultipledepots
4.SplitDeliveryVRP
SplitDeliveryVRP
5.PeriodicVRP
PeriodicVRP
6.StochasticVRP
StochasticVRP
7.VRPwithTimeWindows
VRPwithTimeWindows
OptaPlanner
OptaPlanner
OptaPlanner
Sample
Sample
Similartohard/softconstraints
Samle
GoogleDirectionsAPI
GoogleDirectionsAPI
• Disadvantages:• 2,500freedirectionsrequestsperday• Upto23waypointsallowedineachrequestcontaininganAPIkey• Upto8waypointswhennoAPIkeyissupplied• 10requestspersecond• Optimizationbasedontrafficjamsandroadsinfoonly
OptaPlanner demo
jsprit
jsprit
• jsprit• cansolveproblemswithpickupsanddeliveries,backhauls,heterogeneousfleets,finiteandinfinitefleets,multipledepots,timewindows,openroutes,differentstartandendlocations,multiplecapacitydimensions,initialloads,skills…• allowsyoutodefineadditionalstateful andstatelessconstraintstoaccountfortherichnessofyourproblem.• isbenchmarkedagainstclassicalVRPinstances(e.g.Solomoninstances).• isreleasedunderLGPL(v3).
jsprit demo
HowtocopewithVRPeffectively
• Don’tuseMDVRPwhencustomersaremostlyclusteredaroundonedepot• Themoreconstraintsyouhave,thelessprobabilityyousolveVRP• Don’tdefinecontroversialconstraintswiththesamestrength• Dohaveacodetosatisfyhardconstraintsfirst,thensoftones.• Usepositiveconstraintstomaximizevariableandnegativeones– tominimize
References
• https://github.com/graphhopper/jsprit• http://jsprit.github.io/• https://github.com/droolsjbpm/optaplanner• http://www.diku.dk/hjemmesider/ansatte/sropke/Papers/PHDThesis.pdf• https://docs.jboss.org/optaplanner/release/latest/optaplanner-docs/html_single
Thankyouforattention!
