TestMLMethodFactory.java

/*
 * Encog(tm) Core v3.4 - Java Version
 * http://www.heatonresearch.com/encog/
 * https://github.com/encog/encog-java-core
 
 * Copyright 2008-2016 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.
 *   
 * For more information on Heaton Research copyrights, licenses 
 * and trademarks visit:
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 */
package org.encog.ml.factory;

import org.encog.EncogError;
import org.encog.engine.network.activation.ActivationLinear;
import org.encog.engine.network.activation.ActivationTANH;
import org.encog.ml.svm.SVM;
import org.encog.neural.networks.BasicNetwork;
import org.encog.neural.rbf.RBFNetwork;
import org.junit.Assert;
import org.junit.Test;

public class TestMLMethodFactory {

	public static final String TYPE_FEEDFORWARD = "feedforward";
	public static final String TYPE_RBFNETWORK = "rbfnetwork";
	public static final String TYPE_SVM = "svm";
	public static final String TYPE_SOM = "som";

	@Test
	public void testFactoryFeedforward() {
		String architecture = "?:B->TANH->3->LINEAR->?:B";
		MLMethodFactory factory = new MLMethodFactory();
		BasicNetwork network = (BasicNetwork)factory.create(MLMethodFactory.TYPE_FEEDFORWARD, architecture, 1, 4);
		Assert.assertTrue(network.isLayerBiased(0));
		Assert.assertFalse(network.isLayerBiased(1));
		Assert.assertTrue(network.isLayerBiased(2));
		Assert.assertEquals(3, network.getLayerCount());
		Assert.assertTrue(network.getActivation(0) instanceof ActivationLinear );
		Assert.assertTrue(network.getActivation(1) instanceof ActivationTANH );
		Assert.assertTrue(network.getActivation(2) instanceof ActivationLinear );
		Assert.assertEquals(18,network.encodedArrayLength());
		Assert.assertEquals(1,network.getLayerNeuronCount(0));
		Assert.assertEquals(3,network.getLayerNeuronCount(1));
		Assert.assertEquals(4,network.getLayerNeuronCount(2));
	}

	private void expectError(String t, String a) {
		MLMethodFactory factory = new MLMethodFactory();
		try {
			factory.create(t, a, 2, 1);
			Assert.assertTrue(false);
		} catch(EncogError e) {
			// good
		}
	}

	@Test
	public void testFactoryFeedforwardError() {
		String ARC1 = "?->3->ERROR->?";
		String ARC2 = "?->?->?";
		String ARC3 = "?->3->0->?";
		
		expectError(MLMethodFactory.TYPE_FEEDFORWARD, ARC1);
		expectError(MLMethodFactory.TYPE_FEEDFORWARD, ARC2);
		expectError(MLMethodFactory.TYPE_FEEDFORWARD, ARC3);

	}

	@Test
	public void testFactoryRBF() {
		String architecture = "?->GAUSSIAN(c=4)->?";
		MLMethodFactory factory = new MLMethodFactory();
		RBFNetwork network = (RBFNetwork)factory.create(MLMethodFactory.TYPE_RBFNETWORK, architecture, 1, 4);
		Assert.assertEquals(1,network.getInputCount());
		Assert.assertEquals(4,network.getOutputCount());
		Assert.assertEquals(4,network.getRBF().length);	
	}

	@Test
	public void testFactorySVM() {
		String architecture = "?->C(KERNEL=RBF,TYPE=NEW)->?";
		MLMethodFactory factory = new MLMethodFactory();
		SVM network = (SVM)factory.create(MLMethodFactory.TYPE_SVM, architecture, 4, 1);
		Assert.assertEquals(4,network.getInputCount());
		Assert.assertEquals(1,network.getOutputCount());
	}
}