Re: [jgap-users] KnapSack problem on grid!

[Klaus M. <jg...@kl...>]

Alex,

the NullPointerException seems to result out of a missing client feedback
object.
Please use ksconfig.setClientFeedback(feedbackHandler). For an
implementation of feedbackHandler see the several example classes, e.g.
examples.grid.fitnessDistributed.MyClientFeedback, or simply do an empty
implementation of interface IClientFeedback.

I will enhance the source so that a dummy client feedback handler is set per
default.

Best

Klaus
www.klaus-meffert.com

 

> -----Original Message-----
> From: jga...@li... 
> [mailto:jga...@li...] On Behalf Of Alex Ef
> Sent: Tuesday, May 27, 2008 8:20 PM
> To: jga...@li...
> Subject: [jgap-users] KnapSack problem on grid!
> 
> Hello JGAP users/admin, I have semestrial project on parallel 
> computing and I must make parallel genetic algorithm to solve 
> KnapSack problem. I'm trying to use JGAP to create grid. In 
> examples there is KnapSack problem and grid example. My 
> question is how to combine two examples to one working grid 
> solution? I use Fitness function from KnapSack example for 
> Fitness function in my GridConfiguration class and configure 
> grid in GridConfiguration like that (This is for GridClient - 
> I start grid server and worker before that. All classes are 
> just like in grid example for evolution distributed only 
> Fitness and Config classes are modified):
> 
> ..........
> public class KSEvoConfig extends GridConfigurationBase{
> 	
> 	public double a_knapsackVolume = 10000d;
> 	public final static double[] itemVolumes = {
> 	      50.2d, 14.8d, 27.5d, 6800.0d, 25.0d, 4.75d, 
> 95.36d, 1500.7d, 18365.9d,
> 	      83571.1d};
> 	public final static String[] itemNames = {
> 	      "Monitor", "Fruit", "Radio", " Big TV", 
> "Gameboy", "Small object",
> 	      "Medium object", "Big object", "Huge object", 
> "Gigantic object"};
> 
> 	
> 	public KSEvoConfig() {
> 	    super();
> 	  }
> 
> 	  public void initialize(GridNodeClientConfig a_gridconfig)
> 	      throws Exception {
> 	    
> 	    if (a_gridconfig != null) {
> 	      a_gridconfig.setSessionName("GRID_evolution_distributed");
> 	    }
> 	    Configuration ksconfig = new DefaultConfiguration();
> 		ksconfig.setEventManager(new EventManager());
> 		
> 		ksconfig.setPreservFittestIndividual(true);
> 		ksconfig.setFitnessFunction(new 
> KSEvoFitnessFunction   a_knapsackVolume));
> 		
> 		Gene[] sampleGenes = new Gene[itemVolumes.length];
> 	    for (int i = 0; i < itemVolumes.length; i++) {
> 	      sampleGenes[i] = new IntegerGene(ksconfig, 0,
> 	                                       (int) 
> Math.ceil(a_knapsackVolume /
> 	          itemVolumes[i]));
> 	    }
> 	    IChromosome sampleChromosome = new 
> Chromosome(ksconfig, sampleGenes);
> 	    ksconfig.setSampleChromosome(sampleChromosome);
> 	    
> 	    ksconfig.setPopulationSize(100);
> 	    
> 	    
> 	    setWorkerReturnStrategy(new EvoWorkerReturnStrategy());
> 	    
> 	    setGenotypeInitializer(new EvoGenotypeInitial());
> 	    
> 	    setWorkerEvolveStrategy(new KSEvoStrategy());
> 	    
> 	    setRequestSplitStrategy(new 
> EvoRequestSplitStrategy(ksconfig));
> 	    setConfiguration(ksconfig);
> 	    
> 	    setClientEvolveStrategy(new EvoClientEvolveStrategy());
> 	    
> 	  }........ etc.
> 
> With this setup the grid (Client!) don't work at all. Client 
> conects and login properly, but then - Exception:
> 
> java.lang.NullPointerException
> 	at org.jgap.distr.grid.JGAPClient.evolve(JGAPClient.java:163)
> 	at org.jgap.distr.grid.JGAPClient.run(JGAPClient.java:101)
> 
> Thanking you in adavnce for any help! 
> 
>  
> 
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