Local Search for Planning and Scheduling: ECAI 2000 Workshop, Berlin, Germany, August 21, 2000. Revised Papers

Front Cover
Springer Science & Business Media, Nov 7, 2001 - Computers - 169 pages
Withtheincreasingdeploymentofplanningandschedulingsystems,developers oftenhavetodealwithverylargesearchspaces,real-timeperformancedemands, anddynamicenvironments. Completere'nementmethodsdonotscalewell,- kinglocalsearchmethodstheonlypracticalalternative. Adynamicenvironment alsopromotestheapplicationoflocalsearch,thesearchheuristicsnotnormally beinga'ectedbymodi'cationsofthesearchspace. Furthermore,localsearchis wellsuitedforanytimerequirementsbecausetheoptimizationgoalisimproved iteratively. Suchadvantagesareo'setbytheincompletenessofmostlocalsearch methods,whichmakesitimpossibletoprovetheinconsistencyoroptimalityof thesolutionsgenerated. Popularlocalsearchapproachesincludeevolutionary- gorithms,simulatedannealing,tabusearch,min-con'icts,GSAT,andWalksat. The'rstarticleinthisbook-aninvitedcontributionbyStefanVoß-givesan overviewofthesemethods. ThebookisbasedonthecontributionstotheWorkshoponLocalSearchfor Planning&Scheduling,heldonAugust21,2000atthe14thEuropeanCon- renceonArti'cialIntelligence(ECAI2000)inBerlin,Germany. Theworkshop broughttogetherresearchersfromtheplanningandschedulingcommunitiesto explorethesetopicswithrespecttolocalsearchprocedures. Aftertheworkshop, asecondreviewprocessresultedinthecontributionstothepresentvolume. Voß''soverviewisfollowedbytwoarticles,byHamiezandHaoandGerevini andSerina,onspeci'c"classical"combinatorialsearchproblems. Thearticleby HamiezandHaoaddressestheproblemofsports-leaguescheduling,presenting results achieved by a tabu search method based on a neighborhood of value swaps. GereviniandSerina''sarticleaddressesthetopicthatdominatestherest ofthebook:actionplanning. Itbuildsontheirpreviousworkonlocalsearch onplanninggraphs,presentinganewsearchguidanceheuristicwithdynamic parametertuning. Thenextsetofarticlesdealwithplanningsystemsthatareabletoinc- porateresourcereasoning. The'rstarticle,ofwhichIamtheauthor,makesit clearwhyconventionalplanningsystemscannotproperlyhandleplanningwith resourcesandgivesanoverviewoftheconstraint-basedExcaliburagent''spl- ningsystem,whichdoesnothavetheserestrictions. Thenextthreearticlesare aboutNASAJPL''sASPEN/CASPERsystem. The'rstone-byChien,Knight, andRabideau-focusesonthereplanningcapabilitiesoflocalsearchmethods, presentingtwoempiricalstudiesinwhichacontinuousplanningprocessclearly outperformsarestartstrategy. Thenextarticle,byEngelhardtandChien,shows howlearningcanbeusedtospeedupthesearchforaplan. Thegoalisto'nda setofsearchheuristicsthatguidethesearchaswellaspossible. Thelastarticle inthisblock-byKnight,Rabideau,andChien-proposesanddemonstrates, a technique for aggregating single search moves so that distant states can be reachedmoreeasily. VI Preface Thelastthreearticlesinthisbookaddresstopicsthatarenotdirectlyrelated tolocalsearch,butthedescribedmethodsmakeverylocaldecisionsduringthe search. RefanidisandVlahavasdescribeextensionstotheGRTplanner,e. g. ,a hill-climbingstrategyforactionselection. Theextensionsresultinmuchbetter performancethanwiththeoriginalGRTplanner. Thesecondarticle-byO- india, Sebastia, and Marzal - presents a planning algorithm that successively re'nes a start graph by di'erent phases, e. g. , a phase to guarantee comp- teness. Inthelastarticle,HiraishiandMizoguchipresentasearchmethodfor constructingaroutemap. Constraintswithrespecttomemoryandtimecanbe incorporatedintothesearchprocess. Iwishtoexpressmygratitudetothemembersoftheprogramcommittee, whoactedasreviewersfortheworkshopandthisvolume. Iwouldalsoliketo thank all those who helped to make this workshop a success - including, of course,theparticipantsandtheauthorsofpapersinthisvolume. June2001 AlexanderNareyek WorkshopChair ProgramCommittee EmileH. L. Aarts PhilipsResearch Jos ́eLuisAmbite Univ. ofSouthernCalifornia BlaiBonet UniversityofCalifornia RonenI. Brafman Ben-GurionUniversity SteveChien NASAJPL AndrewDavenport IBMT. J. Watson AlfonsoGerevini Universit`adiBrescia HolgerH. Hoos Univ. ofBritishColumbia AlexanderNareyek GMDFIRST AngeloOddi IP-CNR Mar ́?aC. Ri? Univ. T ́ec. Fed. SantaMar ́?a BartSelman CornellUniversity EdwardTsang UniversityofEssex TableofContents InvitedPaper Meta-heuristics:TheStateoftheArt. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 StefanVoß CombinatorialOptimization SolvingtheSportsLeagueSchedulingProblemwithTabuSearch . . . . . . . . 24 Jean-PhilippeHamiez,Jin-KaoHao LagrangeMultipliersforLocalSearchonPlanningGraphs . . . . . . . . . . . . . . 37 AlfonsoGerevini,IvanSerina PlanningwithResources BeyondthePlan-LengthCriterion . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55 AlexanderNareyek AnEmpiricalEvaluationoftheE'ectiveness ofLocalSearchforReplanning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79 SteveChien,RussellKnight,GreggRabideau Board-LayingTechniquesImproveLocalSearch inMixedPlanningandScheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95 RussellKnight,GreggRabideau,SteveChien EmpiricalEvaluationofLocalSearchMethods forAdaptingPlanningPoliciesinaStochasticEnvironment. . . . . . . . . . . . . 108 BarbaraEngelhardt,SteveChien RelatedApproaches TheGRTPlanner:NewResults . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 120 IoannisRefanidis,IoannisVlahavas IncrementalLocalSearchforPlanningProblems. . . . . . . . . . . . . . . . . . . . . . . 139 EvaOnaindia,LauraSebastia,EliseoMarzal MapDrawingBasedonaResource-ConstrainedSearch foraNavigationSystem . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 158 HironoriHiraishi,FumioMizoguchi AuthorIndex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 171 Meta-heuristics:TheStateoftheArt StefanVoß TechnischeUniversit ̈atBraunschweig Institutfur ̈ Wirtschaftswissenschaften Abt-Jerusalem-Straße7 D-38106Braunschweig,Germany stefan. voss@tu-bs. de Abstract.
 

What people are saying - Write a review

We haven't found any reviews in the usual places.

Contents

The State of the Art
1
Solving the Sports League Scheduling Problem with Tabu Search
24
Lagrange Multipliers for Local Search on Planning Graphs
37
Beyond the PlanLength Criterion
55
An Empirical Evaluation of the Effectiveness of Local Search for Replanning
79
BoardLaying Techniques Improve Local Search in Mixed Planning and Scheduling
95
Empirical Evaluation of Local Search Methods for Adapting Planning Policies in a Stochastic Environment
108
New Results
120
Incremental Local Search for Planning Problems
139
Map Drawing Based on a ResourceConstrained Search for a Navigation System
158
Author Index
170
Copyright

Other editions - View all

Common terms and phrases