Exemplo n.º 1
0
        public static void Test()
        {
            weka.core.Instances data = new weka.core.Instances(new java.io.FileReader("./data/Classification/Communication.arff"));
            data.setClassIndex(data.numAttributes() - 1);

            weka.classifiers.Classifier cls = new weka.classifiers.bayes.BayesNet();


            //Save BayesNet results in .txt file
            using (System.IO.StreamWriter file = new System.IO.StreamWriter("./data/Classification/Communication_Report.txt"))
            {
                file.WriteLine("Performing " + percentSplit + "% split evaluation.");

                int runs = 1;

                // perform cross-validation
                for (int i = 0; i < runs; i++)
                {
                    // randomize data
                    int seed = i + 1;
                    java.util.Random    rand     = new java.util.Random(seed);
                    weka.core.Instances randData = new weka.core.Instances(data);
                    randData.randomize(rand);

                    //weka.classifiers.Evaluation eval = new weka.classifiers.Evaluation(randData);

                    int trainSize             = (int)Math.Round((double)data.numInstances() * percentSplit / 100);
                    int testSize              = data.numInstances() - trainSize;
                    weka.core.Instances train = new weka.core.Instances(data, 0, 0);
                    weka.core.Instances test  = new weka.core.Instances(data, 0, 0);
                    train.setClassIndex(train.numAttributes() - 1);
                    test.setClassIndex(test.numAttributes() - 1);

                    //Print classifier analytics for all the dataset
                    file.WriteLine("EVALUATION OF TEST DATASET.");

                    //int numCorrect = 0;
                    for (int j = 0; j < data.numInstances(); j++)
                    {
                        weka.core.Instance currentInst = randData.instance(j);

                        if (j < trainSize)
                        {
                            train.add(currentInst);
                        }

                        else
                        {
                            test.add(currentInst);

                            /*
                             * double predictedClass = cls.classifyInstance(currentInst);
                             *
                             * double[] prediction = cls.distributionForInstance(currentInst);
                             *
                             * for (int p = 0; p < prediction.Length; p++)
                             * {
                             *  file.WriteLine("Probability of class [{0}] for [{1}] is: {2}", currentInst.classAttribute().value(p), currentInst, Math.Round(prediction[p], 4));
                             * }
                             * file.WriteLine();
                             *
                             * file.WriteLine();
                             * if (predictedClass == data.instance(j).classValue())
                             *  numCorrect++;*/
                        }
                    }

                    // build and evaluate classifier
                    cls.buildClassifier(train);

                    // Test the model
                    weka.classifiers.Evaluation eval = new weka.classifiers.Evaluation(randData);
                    eval.evaluateModel(cls, test);

                    // Print the results as in Weka explorer:
                    //Print statistics
                    String strSummaryTest = eval.toSummaryString();

                    file.WriteLine(strSummaryTest);
                    file.WriteLine();

                    //Print detailed class statistics
                    file.WriteLine(eval.toClassDetailsString());
                    file.WriteLine();

                    //Print confusion matrix
                    file.WriteLine(eval.toMatrixString());
                    file.WriteLine();

                    // Get the confusion matrix
                    double[][] cmMatrixTest = eval.confusionMatrix();

                    System.Console.WriteLine("Bayesian Network results saved in Communication_Report.txt file successfully.");
                }
            }
        }
Exemplo n.º 2
0
        public static void BayesTest()
        {
            try
            {
                weka.core.Instances insts = new weka.core.Instances(new java.io.FileReader("iris.arff"));
                insts.setClassIndex(insts.numAttributes() - 1);

                weka.classifiers.Classifier cl = new weka.classifiers.bayes.BayesNet();
                System.Console.WriteLine("Performing " + percentSplit + "% split evaluation.");

                //randomize the order of the instances in the dataset.
                weka.filters.Filter myRandom = new weka.filters.unsupervised.instance.Randomize();
                myRandom.setInputFormat(insts);
                insts = weka.filters.Filter.useFilter(insts, myRandom);

                int trainSize             = insts.numInstances() * percentSplit / 100;
                int testSize              = insts.numInstances() - trainSize;
                weka.core.Instances train = new weka.core.Instances(insts, 0, trainSize);
                weka.core.Instances test  = new weka.core.Instances(insts, 0, 0);


                cl.buildClassifier(train);
                //print model
                System.Console.WriteLine(cl);

                int numCorrect = 0;
                for (int i = trainSize; i < insts.numInstances(); i++)
                {
                    weka.core.Instance currentInst    = insts.instance(i);
                    double             predictedClass = cl.classifyInstance(currentInst);
                    test.add(currentInst);

                    double[] prediction = cl.distributionForInstance(currentInst);

                    for (int x = 0; x < prediction.Length; x++)
                    {
                        System.Console.WriteLine("Probability of class [{0}] for [{1}] is: {2}", currentInst.classAttribute().value(x), currentInst, Math.Round(prediction[x], 4));
                    }
                    System.Console.WriteLine();

                    if (predictedClass == insts.instance(i).classValue())
                    {
                        numCorrect++;
                    }
                }
                System.Console.WriteLine(numCorrect + " out of " + testSize + " correct (" +
                                         (double)((double)numCorrect / (double)testSize * 100.0) + "%)");

                // Train the model
                weka.classifiers.Evaluation eTrain = new weka.classifiers.Evaluation(train);
                eTrain.evaluateModel(cl, train);

                // Print the results as in Weka explorer:
                //Print statistics
                String strSummaryTrain = eTrain.toSummaryString();
                System.Console.WriteLine(strSummaryTrain);

                //Print detailed class statistics
                System.Console.WriteLine(eTrain.toClassDetailsString());

                //Print confusion matrix
                System.Console.WriteLine(eTrain.toMatrixString());

                // Get the confusion matrix
                double[][] cmMatrixTrain = eTrain.confusionMatrix();


                // Test the model
                weka.classifiers.Evaluation eTest = new weka.classifiers.Evaluation(test);
                eTest.evaluateModel(cl, test);

                // Print the results as in Weka explorer:
                //Print statistics
                String strSummaryTest = eTest.toSummaryString();
                System.Console.WriteLine(strSummaryTest);

                //Print detailed class statistics
                System.Console.WriteLine(eTest.toClassDetailsString());

                //Print confusion matrix
                System.Console.WriteLine(eTest.toMatrixString());

                // Get the confusion matrix
                double[][] cmMatrixTest = eTest.confusionMatrix();
            }

            catch (java.lang.Exception ex)
            {
                ex.printStackTrace();
            }
        }