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Java example source code file (MiniBatchTests.java)

This example Java source code file (MiniBatchTests.java) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

basesparktest, classpathresource, context, datasetassertionfunction, exception, javardd, logger, minibatchtests, object, override, recordreaderfunction, setting, svmlightrecordreader

The MiniBatchTests.java Java example source code

/*
 *
 *  * Copyright 2015 Skymind,Inc.
 *  *
 *  *    Licensed under the Apache License, Version 2.0 (the "License");
 *  *    you may not use this file except in compliance with the License.
 *  *    You may obtain a copy of the License at
 *  *
 *  *        http://www.apache.org/licenses/LICENSE-2.0
 *  *
 *  *    Unless required by applicable law or agreed to in writing, software
 *  *    distributed under the License is distributed on an "AS IS" BASIS,
 *  *    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  *    See the License for the specific language governing permissions and
 *  *    limitations under the License.
 *
 */

package org.deeplearning4j.spark.canova;

import org.apache.spark.api.java.JavaRDD;
import org.apache.spark.api.java.function.Function;
import org.canova.api.records.reader.impl.SVMLightRecordReader;
import org.deeplearning4j.spark.BaseSparkTest;
import org.junit.Test;
import org.nd4j.linalg.dataset.DataSet;
import org.nd4j.linalg.io.ClassPathResource;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import static org.junit.Assert.*;

/**
 * Handle dividing things up by mini batch
 */
public class MiniBatchTests extends BaseSparkTest {
    private static final Logger log = LoggerFactory.getLogger(MiniBatchTests.class);

    @Test
    public void testMiniBatches() throws Exception {
        log.info("Setting up Spark Context...");

        JavaRDD<String> lines = sc.textFile(new ClassPathResource("svmLight/iris_svmLight_0.txt").getFile().toURI().toString()).cache();
        long count = lines.count();
        assertEquals(300,count);
        // gotta map this to a Matrix/INDArray
        JavaRDD<DataSet> points = lines.map(new RecordReaderFunction(new SVMLightRecordReader(), 4, 3)).cache();
        count = points.count();
        assertEquals(300,count);

        JavaRDD<DataSet> miniBatches = new RDDMiniBatches(10,points).miniBatchesJava();
        count = miniBatches.count();
        assertEquals(30,count);

        miniBatches.map(new DataSetAssertionFunction());

    }


    public static class DataSetAssertionFunction implements Function<DataSet,Object> {

        @Override
        public Object call(DataSet dataSet) throws Exception {
            assertTrue(dataSet.getFeatureMatrix().columns() == 150);
            assertTrue(dataSet.numExamples() == 30);
            return null;
        }
    }


}

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