ImplicitAlsCSRBatch.java

/* file: ImplicitAlsCSRBatch.java */
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/*
 //  Content:
 //     Java example of the implicit alternating least squares (ALS) algorithm in
 //     the batch processing mode.
 //
 //     The program trains the implicit ALS model on a training data set.
 */

package com.intel.daal.examples.implicit_als;

import com.intel.daal.algorithms.implicit_als.Model;
import com.intel.daal.algorithms.implicit_als.prediction.ratings.*;
import com.intel.daal.algorithms.implicit_als.training.*;
import com.intel.daal.algorithms.implicit_als.training.init.*;
import com.intel.daal.data_management.data.CSRNumericTable;
import com.intel.daal.data_management.data.NumericTable;
import com.intel.daal.examples.utils.Service;
import com.intel.daal.services.DaalContext;

class ImplicitAlsCSRBatch {
    private static long            nFactors             = 2;
    private static Model           initialModel;
    private static Model           trainedModel;
    private static CSRNumericTable data;
    /* Input data set parameters */
    private static final String    trainDatasetFileName = "../data/batch/implicit_als_csr.csv";

    private static DaalContext context = new DaalContext();

    public static void main(String[] args) throws java.io.FileNotFoundException, java.io.IOException {

        initializeModel();

        trainModel();

        testModel();

        context.dispose();
    }

    private static void initializeModel() throws java.io.FileNotFoundException, java.io.IOException {

        /* Read trainDatasetFileName from a file and create a numeric table for storing the input data */
        data = Service.createSparseTable(context, trainDatasetFileName);

        /* Create an algorithm object to initialize the implicit ALS model with the default method */
        InitBatch initAlgorithm = new InitBatch(context, Double.class, InitMethod.fastCSR);
        initAlgorithm.parameter.setNFactors(nFactors);

        /* Pass a training data set and dependent values to the algorithm */
        initAlgorithm.input.set(InitInputId.data, data);

        /* Initialize the implicit ALS model */
        InitResult initResult = initAlgorithm.compute();

        initialModel = initResult.get(InitResultId.model);
    }

    private static void trainModel() throws java.io.FileNotFoundException, java.io.IOException {
        /* Create an algorithm object to train the implicit ALS model with the default method */
        TrainingBatch alsTrain = new TrainingBatch(context, Double.class, TrainingMethod.fastCSR);
        alsTrain.parameter.setNFactors(nFactors);

        alsTrain.input.set(NumericTableInputId.data, data);
        alsTrain.input.set(ModelInputId.inputModel, initialModel);

        /* Build the implicit ALS model */
        TrainingResult trainingResult = alsTrain.compute();

        trainedModel = trainingResult.get(TrainingResultId.model);
    }

    private static void testModel() {
        /* Create an algorithm object to predict recommendations of the implicit ALS model */
        RatingsBatch algorithm = new RatingsBatch(context, Double.class, RatingsMethod.defaultDense);
        algorithm.parameter.setNFactors(nFactors);

        algorithm.input.set(RatingsModelInputId.model, trainedModel);

        RatingsResult result = algorithm.compute();

        NumericTable predictedRatings = result.get(RatingsResultId.prediction);

        Service.printNumericTable("Predicted ratings:", predictedRatings);
    }
}