Examples with SVMLinearBinaryClassificationTrainer org.apache.ignite.ml.svm.SVMLinearBinaryClassificationTrainer used on opensource projects

Example 1 with SVMLinearBinaryClassificationTrainer

use of org.apache.ignite.ml.svm.SVMLinearBinaryClassificationTrainer in project ignite by apache.

the class SVMBinaryClassificationExample method main.

/**
 * Run example.
 */
public static void main(String[] args) throws InterruptedException {
    System.out.println();
    System.out.println(">>> SVM Binary classification model over cached dataset usage example started.");
    // Start ignite grid.
    try (Ignite ignite = Ignition.start("examples/config/example-ignite.xml")) {
        System.out.println(">>> Ignite grid started.");
        IgniteThread igniteThread = new IgniteThread(ignite.configuration().getIgniteInstanceName(), SVMBinaryClassificationExample.class.getSimpleName(), () -> {
            IgniteCache<Integer, double[]> dataCache = getTestCache(ignite);
            SVMLinearBinaryClassificationTrainer<Integer, double[]> trainer = new SVMLinearBinaryClassificationTrainer<>();
            SVMLinearBinaryClassificationModel mdl = trainer.fit(new CacheBasedDatasetBuilder<>(ignite, dataCache), (k, v) -> Arrays.copyOfRange(v, 1, v.length), (k, v) -> v[0], 4);
            System.out.println(">>> SVM model " + mdl);
            System.out.println(">>> ---------------------------------");
            System.out.println(">>> | Prediction\t| Ground Truth\t|");
            System.out.println(">>> ---------------------------------");
            int amountOfErrors = 0;
            int totalAmount = 0;
            // Build confusion matrix. See https://en.wikipedia.org/wiki/Confusion_matrix
            int[][] confusionMtx = { { 0, 0 }, { 0, 0 } };
            try (QueryCursor<Cache.Entry<Integer, double[]>> observations = dataCache.query(new ScanQuery<>())) {
                for (Cache.Entry<Integer, double[]> observation : observations) {
                    double[] val = observation.getValue();
                    double[] inputs = Arrays.copyOfRange(val, 1, val.length);
                    double groundTruth = val[0];
                    double prediction = mdl.apply(new DenseLocalOnHeapVector(inputs));
                    totalAmount++;
                    if (groundTruth != prediction)
                        amountOfErrors++;
                    int idx1 = (int) prediction == -1.0 ? 0 : 1;
                    int idx2 = (int) groundTruth == -1.0 ? 0 : 1;
                    confusionMtx[idx1][idx2]++;
                    System.out.printf(">>> | %.4f\t\t| %.4f\t\t|\n", prediction, groundTruth);
                }
                System.out.println(">>> ---------------------------------");
                System.out.println("\n>>> Absolute amount of errors " + amountOfErrors);
                System.out.println("\n>>> Accuracy " + (1 - amountOfErrors / (double) totalAmount));
            }
            System.out.println("\n>>> Confusion matrix is " + Arrays.deepToString(confusionMtx));
        });
        igniteThread.start();
        igniteThread.join();
    }
}