| /* |
| * 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.math4.neuralnet.sofm; |
| |
| import org.junit.Test; |
| import org.junit.Assert; |
| |
| /** |
| * Tests for {@link NeighbourhoodSizeFunctionFactory} class. |
| */ |
| public class NeighbourhoodSizeFunctionFactoryTest { |
| @Test(expected = IllegalArgumentException.class) |
| public void testExponentialDecayPrecondition1() { |
| NeighbourhoodSizeFunctionFactory.exponentialDecay(0, 0, 2); |
| } |
| @Test(expected = IllegalArgumentException.class) |
| public void testExponentialDecayPrecondition2() { |
| NeighbourhoodSizeFunctionFactory.exponentialDecay(1, 0, 2); |
| } |
| @Test(expected = IllegalArgumentException.class) |
| public void testExponentialDecayPrecondition3() { |
| NeighbourhoodSizeFunctionFactory.exponentialDecay(1, 1, 100); |
| } |
| @Test(expected = IllegalArgumentException.class) |
| public void testExponentialDecayPrecondition4() { |
| NeighbourhoodSizeFunctionFactory.exponentialDecay(2, 1, 0); |
| } |
| |
| @Test |
| 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)); |
| } |
| |
| @Test(expected = IllegalArgumentException.class) |
| public void testQuasiSigmoidDecayPrecondition1() { |
| NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(0d, -1d, 2); |
| } |
| @Test(expected = IllegalArgumentException.class) |
| public void testQuasiSigmoidDecayPrecondition3() { |
| NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(1d, 0d, 100); |
| } |
| @Test(expected = IllegalArgumentException.class) |
| public void testQuasiSigmoidDecayPrecondition4() { |
| NeighbourhoodSizeFunctionFactory.quasiSigmoidDecay(1d, -1d, 0); |
| } |
| |
| @Test |
| 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); |
| } |
| } |