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Java example source code file (NeighbourhoodSizeFunctionFactoryTest.java)

This example Java source code file (NeighbourhoodSizeFunctionFactoryTest.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.

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Java - Java tags/keywords

neighbourhoodsizefunction, neighbourhoodsizefunctionfactorytest, test

The NeighbourhoodSizeFunctionFactoryTest.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,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package org.apache.commons.math3.ml.neuralnet.sofm;

import org.apache.commons.math3.exception.NotStrictlyPositiveException;
import org.apache.commons.math3.exception.NumberIsTooLargeException;
import org.junit.Test;
import org.junit.Assert;

 * Tests for {@link NeighbourhoodSizeFunctionFactory} class.
public class NeighbourhoodSizeFunctionFactoryTest {
    public void testExponentialDecayPrecondition1() {
        NeighbourhoodSizeFunctionFactory.exponentialDecay(0, 0, 2);
    public void testExponentialDecayPrecondition2() {
        NeighbourhoodSizeFunctionFactory.exponentialDecay(1, 0, 2);
    public void testExponentialDecayPrecondition3() {
        NeighbourhoodSizeFunctionFactory.exponentialDecay(1, 1, 100);
    public void testExponentialDecayPrecondition4() {
        NeighbourhoodSizeFunctionFactory.exponentialDecay(2, 1, 0);

    public void testExponentialDecayTrivial() {
        final int n = 65;
        final int init = 4;
        final int valueAtN = 3;
        final NeighbourhoodSizeFunction f
            = NeighbourhoodSizeFunctionFactory.exponentialDecay(init, valueAtN, n);

        Assert.assertEquals(init, f.value(0));
        Assert.assertEquals(valueAtN, f.value(n));
        Assert.assertEquals(0, f.value(Long.MAX_VALUE));

    public void testQuasiSigmoidDecayPrecondition1() {
        NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(0d, -1d, 2);
    public void testQuasiSigmoidDecayPrecondition3() {
        NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(1d, 0d, 100);
    public void testQuasiSigmoidDecayPrecondition4() {
        NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(1d, -1d, 0);

    public void testQuasiSigmoidDecayTrivial() {
        final int n = 65;
        final double init = 4;
        final double slope = -1e-1;
        final NeighbourhoodSizeFunction f
            = NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(init, slope, n);

        Assert.assertEquals(init, f.value(0), 0d);
        Assert.assertEquals(0, f.value(Long.MAX_VALUE), 0d);

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