// Assume user uses a pre-trained model from model zoo, they just need to load it
    Criteria<Image, Classifications> criteria =
            Criteria.builder()
                    .optApplication(Application.CV.OBJECT_DETECTION) // find object dection model
                    .setTypes(Image.class, Classifications.class) // define input and output
                    .optFilter("backbone", "resnet50") // choose network architecture
                    .build();

    try (ZooModel<Image, Classifications> model = ModelZoo.loadModel(criteria)) {
        try (Predictor<Image, Classifications> predictor = model.newPredictor()) {
            Image img = ImageFactory.getInstance().fromUrl("http://..."); // read image
            Classifications result = predictor.predict(img);

            // get the classification and probability
            ...
        }
    }

    // Construct your neural network with built-in blocks
    Block block = new Mlp(28, 28);

    try (Model model = Model.newInstance()) { // Create an empty model
        model.setBlock(block); // set neural network to model

        // Get training and validation dataset (MNIST dataset)
        Dataset trainingSet = new Mnist.Builder().setUsage(Usage.TRAIN) ... .build();
        Dataset validateSet = new Mnist.Builder().setUsage(Usage.TEST) ... .build();

        // Setup training configurations, such as Initializer, Optimizer, Loss ...
        TrainingConfig config = setupTrainingConfig();
        try (Trainer trainer = model.newTrainer(config)) {
            /*
             * Configure input shape based on dataset to initialize the trainer.
             * 1st axis is batch axis, we can use 1 for initialization.
             * MNIST is 28x28 grayscale image and pre processed into 28 * 28 NDArray.
             */
            Shape inputShape = new Shape(1, 28 * 28);
            trainer.initialize(new Shape[] {inputShape});

            TrainingUtils.fit(trainer, epoch, trainingSet, validateSet);
        }

        // Save the model
        model.save(modelDir, "mlp");
    }