Package org.encog.neural.activation

Source Code of org.encog.neural.activation.TestActivationTANH

/*
* Encog(tm) Core v3.3 - Java Version
* http://www.heatonresearch.com/encog/
* https://github.com/encog/encog-java-core
* Copyright 2008-2014 Heaton Research, 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.
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package org.encog.neural.activation;

import junit.framework.TestCase;

import org.encog.engine.network.activation.ActivationTANH;
import org.junit.Assert;
import org.junit.Test;

public class TestActivationTANH extends TestCase {
  @Test
  public void testTANH() throws Throwable {
    ActivationTANH activation = new ActivationTANH();
    Assert.assertTrue(activation.hasDerivative());

    ActivationTANH clone = (ActivationTANH) activation.clone();
    Assert.assertNotNull(clone);

    double[] input = { 0.0  };

    activation.activationFunction(input,0,input.length);

    Assert.assertEquals(0.0, input[0], 0.1);   

    // test derivative, should throw an error
    input[0] = activation.derivativeFunction(input[0],input[0]);
    Assert.assertEquals(1.0, input[0], 0.1);


  }

}
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