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Java example source code file (NeuronTest.java)

This example Java source code file (NeuronTest.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

bytearrayinputstream, bytearrayoutputstream, classnotfoundexception, ioexception, neuron, neurontest, objectinputstream, objectoutputstream, test

The NeuronTest.java Java example source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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.apache.commons.math3.ml.neuralnet;

import java.io.ByteArrayOutputStream;
import java.io.ByteArrayInputStream;
import java.io.ObjectOutputStream;
import java.io.ObjectInputStream;
import java.io.IOException;
import org.junit.Test;
import org.junit.Assert;

/**
 * Tests for {@link Neuron}.
 */
public class NeuronTest {
    @Test
    public void testGetIdentifier() {
        final long id = 1234567;
        final Neuron n = new Neuron(id, new double[] { 0 });

        Assert.assertEquals(id, n.getIdentifier());
    }

    @Test
    public void testGetSize() {
        final double[] features = { -1, -1e-97, 0, 23.456, 9.01e203 } ;
        final Neuron n = new Neuron(1, features);
        Assert.assertEquals(features.length, n.getSize());
    }

    @Test
    public void testGetFeatures() {
        final double[] features = { -1, -1e-97, 0, 23.456, 9.01e203 } ;
        final Neuron n = new Neuron(1, features);

        final double[] f = n.getFeatures();
        // Accessor returns a copy.
        Assert.assertFalse(f == features);

        // Values are the same.
        Assert.assertEquals(features.length, f.length);
        for (int i = 0; i < features.length; i++) {
            Assert.assertEquals(features[i], f[i], 0d);
        }
    }

    @Test
    public void testCompareAndSetFeatures() {
        final Neuron n = new Neuron(1, new double[] { 0 });
        double[] expect = n.getFeatures();
        double[] update = new double[] { expect[0] + 1.23 };

        // Test "success".
        boolean ok = n.compareAndSetFeatures(expect, update);
        // Check that the update is reported as successful.
        Assert.assertTrue(ok);
        // Check that the new value is correct.
        Assert.assertEquals(update[0],  n.getFeatures()[0], 0d);

        // Test "failure".
        double[] update1 = new double[] { update[0] + 4.56 };
        // Must return "false" because the neuron has been
        // updated: a new update can only succeed if "expect"
        // is set to the new features.
        ok = n.compareAndSetFeatures(expect, update1);
        // Check that the update is reported as failed.
        Assert.assertFalse(ok);
        // Check that the value was not changed.
        Assert.assertEquals(update[0],  n.getFeatures()[0], 0d);
    }

    @Test
    public void testCopy() {
        final Neuron n = new Neuron(1, new double[] { 9.87 });

        // Update original.
        double[] update = new double[] { n.getFeatures()[0] + 2.34 };
        n.compareAndSetFeatures(n.getFeatures(), update);

        // Create a copy.
        final Neuron copy = n.copy();

        // Check that original and copy have the same value.
        Assert.assertTrue(n.getFeatures()[0] == copy.getFeatures()[0]);
        Assert.assertEquals(n.getNumberOfAttemptedUpdates(),
                            copy.getNumberOfAttemptedUpdates());

        // Update original.
        update = new double[] { 1.23 * n.getFeatures()[0] };
        n.compareAndSetFeatures(n.getFeatures(), update);

        // Check that original and copy differ.
        Assert.assertFalse(n.getFeatures()[0] == copy.getFeatures()[0]);
        Assert.assertNotEquals(n.getNumberOfSuccessfulUpdates(),
                               copy.getNumberOfSuccessfulUpdates());
    }

    @Test
    public void testSerialize()
        throws IOException,
               ClassNotFoundException {
        final Neuron out = new Neuron(123, new double[] { -98.76, -1, 0, 1e-23, 543.21, 1e234 });
        final ByteArrayOutputStream bos = new ByteArrayOutputStream();
        final ObjectOutputStream oos = new ObjectOutputStream(bos);
        oos.writeObject(out);

        final ByteArrayInputStream bis = new ByteArrayInputStream(bos.toByteArray());
        final ObjectInputStream ois = new ObjectInputStream(bis);
        final Neuron in = (Neuron) ois.readObject();

        // Same identifier.
        Assert.assertEquals(out.getIdentifier(),
                            in.getIdentifier());
        // Same values.
        final double[] outF = out.getFeatures();
        final double[] inF = in.getFeatures();
        Assert.assertEquals(outF.length, inF.length);
        for (int i = 0; i < outF.length; i++) {
            Assert.assertEquals(outF[i], inF[i], 0d);
        }
    }
}

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