optaplanner

问题 Something that recently caught my attention was a step being slower than others when a "new best score" is produced. This is definitely the solution cloning that is happening at every step that produces a "new best score". So this is okay if the "new best score" steps are not in a row. If for example we have 50 steps in a row the solution cloning process will be executed 50 times. A smarter way would be to do the cloning process at the end of the sequence(only once). Is this something that

问题 Hello I am new to optaplanner. I am trying to use the vrp (tw) example. I'll like to set real distances (route distances) in order to get a real solution. I have real distances between all points in a double NXN matrix (distance(a,b)<>distance(b,a)), so, how can I use the matrix in the .xml (.vrp) input file to solve vrp problem ? Note : my matrix is about from 2X10X10 to 2X100X100. Thanks in advance. opp 回答1: Here is the way I went. There might be much better solutions than this - I have to

问题 I'm trying to package a project using OptaPlanner 6.0.1 libraries into a .jar through IntelliJ IDEA's jar artifact but instead of my manifest.mf containing the standard Manifest-Version: 1.0 Main-Class: a.b.c.app the jar uses the one supplied in ecj-3.7.2.jar, one of OptaPlanner's supporting libraries: Manifest-Version: 1.0 Build-Jdk: 1.6.0_26 Built-By: ibrandt Created-By: Apache Maven Archiver-Version: Plexus Archiver Because of this, a "no main manifest attribute, in appname.jar" error

问题 Is there a way to access planning variable's assignment during planning? In my use case, I want to assign a planning variable with certain status only one time only during planning. After that I don't want to use that planning variable. I know that in optaplanner, a planning variable/problem fact can not change, so i can not change its status. Is there a way to get list of planning variable assignment during planning so that in java code or drools file, i can avoid re-assignment if it has

问题 My program works fine from my IDE (IntelliJ) but for some reason, when I try to create a jar file I get following error when I run the program from a terminal: Exception in thread "main" java.lang.NullPointerException at org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildDroolsScoreDirectorFactory(ScoreDirectorFactoryConfig.java:461) org.optaplanner.core.config.score.director.ScoreDirectorFactoryConfig.buildScoreDirectorFactory(ScoreDirectorFactoryConfig.java:331) org

问题 currently i am implementing my second project in OptaPlanner. I am retrieving the following error: Exception in thread "main" java.lang.IllegalArgumentException: A planning entity is an instance of a entitySubclass (class com.company.Assignment) that is not configured as a planning entity. If that class (Assignment) (or superclass thereof) is not a entityClass ([class com.company.Car]), check your Solution implementation's annotated methods. If it is, check your solver configuration. My

问题 I am currently trying to get my grip on OptaPlanner as it seems to be the perfect solution for a problem I have. Basically the Project job scheduling example is what I am going for, but as I only know my Java basics this is way to complex to start with. So I am trying to start with a very limited example and work my way up from there: I have tasks with a duration and one defined predecessor. The planning entity is the time each task starts. I have a hard score that punishes tasks starting

问题 I have initialized and started a solver, I have registered a listener for the best solution change but I would also like to know when solving has ended. I have configured the logger and it correctly shows when the solver has stopped solving (when the termination condition is met or when it is terminated early). I would like to know when the solver has finished, whichever way it ended. Here's my current code for listening for best solution changes solver.addEventListener(new

问题 I have developed a working solver, which generates the unsolved solution directly from database(without and XML file). Now I am starting to develop it's benchmarker. Since all the example benchmarkers utilizes inputSolutionFile(xml files), I am trying to get the unsolved solution I generated into the PlannerBenchmarkFactory. Am I able to bypass creating the xml inputSolutionFile? If not, how would I serialize the unsolved solution into an acceptable inputSolutionFile? 回答1: One way that should

问题 I am using OptaPlanner to optimize a vehicle routing problem very similar to the provided example. I am faced with the following challenge and will appreciate some ideas. Some of the visits to customers have relations to other visits, for example: A visit must start at the same time with another visit. A visit must start 2 hours after another visit finishes. A visit must be allocated to the same vehicle allocated to another visit. The challenge is: How to allow moves of the visits without