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Java example source code file (QuasiSigmoidDecayFunctionTest.java)

This example Java source code file (QuasiSigmoidDecayFunctionTest.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

quasisigmoiddecayfunction, quasisigmoiddecayfunctiontest, test

The QuasiSigmoidDecayFunctionTest.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.sofm.util;

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 QuasiSigmoidDecayFunction} class
 */
public class QuasiSigmoidDecayFunctionTest {
    @Test(expected=NotStrictlyPositiveException.class)
    public void testPrecondition1() {
        new QuasiSigmoidDecayFunction(0d, -1d, 2);
    }
    @Test(expected=NumberIsTooLargeException.class)
    public void testPrecondition3() {
        new QuasiSigmoidDecayFunction(1d, 0d, 100);
    }
    @Test(expected=NotStrictlyPositiveException.class)
    public void testPrecondition4() {
        new QuasiSigmoidDecayFunction(1d, -1d, 0);
    }

    @Test
    public void testTrivial() {
        final int n = 65;
        final double init = 4;
        final double slope = -1e-1;
        final QuasiSigmoidDecayFunction f = new QuasiSigmoidDecayFunction(init, slope, n);

        Assert.assertEquals(init, f.value(0), 0d);
        // Very approximate derivative.
        Assert.assertEquals(slope, f.value(n + 1) - f.value(n), 1e-4);
        Assert.assertEquals(0, f.value(Long.MAX_VALUE), 0d);
    }
}

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