source: trunk/CrossPare/src/de/ugoe/cs/cpdp/Experiment.java @ 20

package de.ugoe.cs.cpdp;

import java.io.File;
import java.util.LinkedList;
import java.util.List;
import java.util.logging.Level;

import org.apache.commons.collections4.list.SetUniqueList;

import weka.core.Instances;
import de.ugoe.cs.cpdp.dataprocessing.IProcessesingStrategy;
import de.ugoe.cs.cpdp.dataprocessing.ISetWiseProcessingStrategy;
import de.ugoe.cs.cpdp.dataselection.IPointWiseDataselectionStrategy;
import de.ugoe.cs.cpdp.dataselection.ISetWiseDataselectionStrategy;
import de.ugoe.cs.cpdp.eval.IEvaluationStrategy;
import de.ugoe.cs.cpdp.loader.IVersionLoader;
import de.ugoe.cs.cpdp.training.ISetWiseTrainingStrategy;
import de.ugoe.cs.cpdp.training.ITrainer;
import de.ugoe.cs.cpdp.training.ITrainingStrategy;
import de.ugoe.cs.cpdp.versions.IVersionFilter;
import de.ugoe.cs.cpdp.versions.SoftwareVersion;
import de.ugoe.cs.util.console.Console;

/**
 * Class responsible for executing an experiment according to an {@link ExperimentConfiguration}. The steps of an experiment are as follows:
 * <ul>
 *  <li>load the data from the provided data path</li>
 *  <li>filter the data sets according to the provided version filters</li>
 *  <li>execute the following steps for each data sets as test data that is not ignored through the test version filter:
 *  <ul>
 *   <li>filter the data sets to setup the candidate training data:
 *   <ul>
 *    <li>remove all data sets from the same project</li>
 *    <li>filter all data sets according to the training data filter
 *   </ul></li>
 *   <li>apply the setwise preprocessors</li>
 *   <li>apply the setwise data selection algorithms</li>
 *   <li>apply the setwise postprocessors</li>
 *   <li>train the setwise training classifiers</li>
 *   <li>unify all remaining training data into one data set</li>
 *   <li>apply the preprocessors</li>
 *   <li>apply the pointwise data selection algorithms</li>
 *   <li>apply the postprocessors</li>
 *   <li>train the normal classifiers</li>
 *   <li>evaluate the results for all trained classifiers on the training data</li>
 *  </ul></li>
 * </ul>
 * 
 * Note that this class implements {@link Runnable}, i.e., each experiment can be started in its own thread.
 * @author Steffen Herbold
 */
public class Experiment implements Runnable {

        /**
         * configuration of the experiment
         */
        private final ExperimentConfiguration config;
        
        /**
         * Constructor. Creates a new experiment based on a configuration.
         * @param config configuration of the experiment
         */
        public Experiment(ExperimentConfiguration config) {
                this.config = config;
        }
        
        /**
         * Executes the experiment with the steps as described in the class comment.
         * @see Runnable#run() 
         */
        @Override
        public void run() {
                final List<SoftwareVersion> versions = new LinkedList<>();
                
                for(IVersionLoader loader : config.getLoaders()) {
                        versions.addAll(loader.load());
                }
                
                for( IVersionFilter filter : config.getVersionFilters() ) {
                        filter.apply(versions);
                }
                boolean writeHeader = true;
                int versionCount = 1;
                int testVersionCount = 0;
                
                for( SoftwareVersion testVersion : versions ) {
                        if( isVersion(testVersion, config.getTestVersionFilters()) ) {
                                testVersionCount++;
                        }
                }
                
                for( SoftwareVersion testVersion : versions ) {
                        if( isVersion(testVersion, config.getTestVersionFilters()) ) {
                                Console.traceln(Level.INFO, String.format("[%s] [%02d/%02d] %s: starting", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion()));
                                
                                // Setup testdata and training data
                                Instances testdata = testVersion.getInstances();
                                String testProject = testVersion.getProject();
                                SetUniqueList<Instances> traindataSet = SetUniqueList.setUniqueList(new LinkedList<Instances>());
                                for( SoftwareVersion trainingVersion : versions ) {
                                        if( isVersion(trainingVersion, config.getTrainingVersionFilters()) ) {
                                                if( trainingVersion!=testVersion ) {
                                                        if( !trainingVersion.getProject().equals(testProject) ) {
                                                                traindataSet.add(trainingVersion.getInstances());
                                                        }
                                                }
                                        }
                                }
                                
                                for( ISetWiseProcessingStrategy processor : config.getSetWisePreprocessors() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying setwise preprocessor %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), processor.getClass().getName()));
                                        processor.apply(testdata, traindataSet);
                                }
                                for( ISetWiseDataselectionStrategy dataselector : config.getSetWiseSelectors() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying setwise selection %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), dataselector.getClass().getName()));
                                        dataselector.apply(testdata, traindataSet);
                                }
                                for( ISetWiseProcessingStrategy processor : config.getSetWisePostprocessors() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying setwise postprocessor %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), processor.getClass().getName()));
                                        processor.apply(testdata, traindataSet);
                                }
                                for( ISetWiseTrainingStrategy setwiseTrainer : config.getSetWiseTrainers() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying setwise trainer %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), setwiseTrainer.getName()));
                                        setwiseTrainer.apply(traindataSet);
                                }
                                Instances traindata = makeSingleTrainingSet(traindataSet);
                                for( IProcessesingStrategy processor : config.getPreProcessors() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying preprocessor %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), processor.getClass().getName()));
                                        processor.apply(testdata, traindata);
                                }
                                for( IPointWiseDataselectionStrategy dataselector : config.getPointWiseSelectors() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying pointwise selection %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), dataselector.getClass().getName()));
                                        traindata = dataselector.apply(testdata, traindata);
                                }
                                for( IProcessesingStrategy processor : config.getPostProcessors() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying setwise postprocessor %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), processor.getClass().getName()));
                                        processor.apply(testdata, traindata);
                                }
                                for( ITrainingStrategy trainer : config.getTrainers() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying trainer %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), trainer.getName()));
                                        trainer.apply(traindata);
                                }
                                File resultsDir = new File(config.getResultsPath());
                                if (!resultsDir.exists()) {
                                        resultsDir.mkdir();
                                }
                                for( IEvaluationStrategy evaluator : config.getEvaluators() ) {
                                        Console.traceln(Level.FINE, String.format("[%s] [%02d/%02d] %s: applying evaluator %s", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion(), evaluator.getClass().getName()));
                                        List<ITrainer> allTrainers = new LinkedList<>();
                                        for( ISetWiseTrainingStrategy setwiseTrainer : config.getSetWiseTrainers() ) {
                                                allTrainers.add(setwiseTrainer);
                                        }
                                        for( ITrainingStrategy trainer : config.getTrainers() ) {
                                                allTrainers.add(trainer);
                                        }
                                        if( writeHeader ) {
                                                evaluator.setParameter(config.getResultsPath() + "/" + config.getExperimentName() + ".csv");
                                        }
                                        evaluator.apply(testdata, traindata, allTrainers, writeHeader);
                                        writeHeader = false;
                                }
                                Console.traceln(Level.INFO, String.format("[%s] [%02d/%02d] %s: finished", config.getExperimentName(), versionCount, testVersionCount, testVersion.getVersion()));
                                versionCount++;
                        }
                }
        }
        
        /**
         * Helper method that checks if a version passes all filters.
         * @param version version that is checked
         * @param filters list of the filters
         * @return true, if the version passes all filters, false otherwise
         */
        private boolean isVersion(SoftwareVersion version, List<IVersionFilter> filters) {
                boolean result = true;
                for( IVersionFilter filter : filters) {
                        result &= !filter.apply(version);
                }
                return result;
        }

        /**
         * Helper method that combines a set of Weka {@link Instances} sets into a single {@link Instances} set.
         * @param traindataSet set of {@link Instances} to be combines
         * @return single {@link Instances} set
         */
        public static Instances makeSingleTrainingSet(SetUniqueList<Instances> traindataSet) {
                Instances traindataFull = null;
                for( Instances traindata : traindataSet) {
                        if( traindataFull==null ) {
                                traindataFull = new Instances(traindata);
                        } else {
                                for( int i=0 ; i<traindata.numInstances() ; i++ ) {
                                        traindataFull.add(traindata.instance(i));
                                }
                        }
                }
                return traindataFull;
        }
}