@Test
public void testDualOutput() {
BasicNetwork network = new BasicNetwork();
network.addLayer(new BasicLayer(null, true, 2));
network.addLayer(new BasicLayer(new ActivationSigmoid(), true, 2));
network.addLayer(new BasicLayer(new ActivationSigmoid(), false, 2));
network.getStructure().finalizeStructure();
(new ConsistentRandomizer(-1, 1)).randomize(network);
MLDataSet trainingData = new BasicMLDataSet(XOR.XOR_INPUT, XOR.XOR_IDEAL2);
HessianFD testFD = new HessianFD();
testFD.init(network, trainingData);
testFD.compute();
// dump(testFD, "FD");
HessianCR testCR = new HessianCR();
testCR.init(network, trainingData);
testCR.compute();
// dump(testCR, "CR");
Assert.assertTrue(testCR.getHessianMatrix().equals(testFD.getHessianMatrix(), 4));
}
/**
* Create a feed forward network.
*
* @param architecture The architecture string to use.
* @param input The input count.
* @param output The output count.
* @return The feedforward network.
*/
public final MLMethod create(final String architecture, final int input, final int output) {
if (input <= 0) {
throw new EncogError("Must have at least one input for feedforward.");
}
if (output <= 0) {
throw new EncogError("Must have at least one output for feedforward.");
}
final BasicNetwork result = new BasicNetwork();
final List<String> layers = ArchitectureParse.parseLayers(architecture);
ActivationFunction af = new ActivationLinear();
int questionPhase = 0;
for (final String layerStr : layers) {
int defaultCount;
// determine default
if (questionPhase == 0) {
defaultCount = input;
} else {
defaultCount = output;
}
final ArchitectureLayer layer = ArchitectureParse.parseLayer(layerStr, defaultCount);
final boolean bias = layer.isBias();
String part = layer.getName();
if (part != null) {
part = part.trim();
} else {
part = "";
}
ActivationFunction lookup = this.factory.create(part);
if (lookup != null) {
af = lookup;
} else {
if (layer.isUsedDefault()) {
questionPhase++;
if (questionPhase > 2) {
throw new EncogError("Only two ?'s may be used.");
}
}
if (layer.getCount() == 0) {
throw new EncogError(
"Unknown architecture element: " + architecture + ", can't parse: " + part);
}
result.addLayer(new BasicLayer(af, bias, layer.getCount()));
}
}
result.getStructure().finalizeStructure();
result.reset();
return result;
}
/**
* Convert to an array. This is used with some training algorithms that require that the "memory"
* of the neuron(the weight and bias values) be expressed as a linear array.
*
* @param network The network to encode.
* @return The memory of the neuron.
*/
public static double[] networkToArray(final BasicNetwork network) {
final int size = network.getStructure().calculateSize();
// allocate an array to hold
final double[] result = new double[size];
int index = 0;
for (final Layer layer : network.getStructure().getLayers()) {
// process layer bias
if (layer.hasBias()) {
for (int i = 0; i < layer.getNeuronCount(); i++) {
result[index++] = layer.getBiasWeight(i);
}
}
// process synapses
for (final Synapse synapse : network.getStructure().getPreviousSynapses(layer)) {
if (synapse.getMatrix() != null) {
// process each weight matrix
for (int x = 0; x < synapse.getToNeuronCount(); x++) {
for (int y = 0; y < synapse.getFromNeuronCount(); y++) {
result[index++] = synapse.getMatrix().get(y, x);
}
}
}
}
}
return result;
}
/**
* Generate the network.
*
* @return The generated network.
*/
public BasicNetwork generate() {
Layer input, instar, outstar;
int y = PatternConst.START_Y;
final BasicNetwork network = new BasicNetwork();
network.addLayer(input = new BasicLayer(new ActivationLinear(), false, this.inputCount));
network.addLayer(instar = new BasicLayer(new ActivationCompetitive(), false, this.instarCount));
network.addLayer(outstar = new BasicLayer(new ActivationLinear(), false, this.outstarCount));
network.getStructure().finalizeStructure();
network.reset();
input.setX(PatternConst.START_X);
input.setY(y);
y += PatternConst.INC_Y;
instar.setX(PatternConst.START_X);
instar.setY(y);
y += PatternConst.INC_Y;
outstar.setX(PatternConst.START_X);
outstar.setY(y);
// tag as needed
network.tagLayer(BasicNetwork.TAG_INPUT, input);
network.tagLayer(BasicNetwork.TAG_OUTPUT, outstar);
network.tagLayer(CPNPattern.TAG_INSTAR, instar);
network.tagLayer(CPNPattern.TAG_OUTSTAR, outstar);
return network;
}
public void testFeedforwardPersist() throws Throwable {
NeuralDataSet trainingData = new BasicNeuralDataSet(XOR.XOR_INPUT, XOR.XOR_IDEAL);
BasicNetwork network = createNetwork();
Train train = new Backpropagation(network, trainingData, 0.7, 0.9);
for (int i = 0; i < 5000; i++) {
train.iteration();
network = (BasicNetwork) train.getNetwork();
}
TestCase.assertTrue("Error too high for backpropagation", train.getError() < 0.1);
TestCase.assertTrue("XOR outputs not correct", XOR.verifyXOR(network, 0.1));
EncogPersistedCollection encog = new EncogPersistedCollection();
encog.add(network);
encog.save("encogtest.xml");
EncogPersistedCollection encog2 = new EncogPersistedCollection();
encog2.load("encogtest.xml");
new File("encogtest.xml").delete();
BasicNetwork n = (BasicNetwork) encog2.getList().get(0);
TestCase.assertTrue("Error too high for load", n.calculateError(trainingData) < 0.1);
}
public void testHopfieldPersist() throws Exception {
boolean input[] = {true, false, true, false};
BasicNetwork network = new BasicNetwork();
network.addLayer(new HopfieldLayer(4));
NeuralData data = new BiPolarNeuralData(input);
Train train = new TrainHopfield(data, network);
train.iteration();
EncogPersistedCollection encog = new EncogPersistedCollection();
encog.add(network);
encog.save("encogtest.xml");
EncogPersistedCollection encog2 = new EncogPersistedCollection();
encog2.load("encogtest.xml");
new File("encogtest.xml").delete();
BasicNetwork network2 = (BasicNetwork) encog2.getList().get(0);
BiPolarNeuralData output = (BiPolarNeuralData) network2.compute(new BiPolarNeuralData(input));
TestCase.assertTrue(output.getBoolean(0));
TestCase.assertFalse(output.getBoolean(1));
TestCase.assertTrue(output.getBoolean(2));
TestCase.assertFalse(output.getBoolean(3));
}
public static void train(File dataDir) {
final File networkFile = new File(dataDir, Config.NETWORK_FILE);
final File trainingFile = new File(dataDir, Config.TRAINING_FILE);
// network file
if (!networkFile.exists()) {
System.out.println("Can't read file: " + networkFile.getAbsolutePath());
return;
}
BasicNetwork network = (BasicNetwork) EncogDirectoryPersistence.loadObject(networkFile);
// training file
if (!trainingFile.exists()) {
System.out.println("Can't read file: " + trainingFile.getAbsolutePath());
return;
}
final MLDataSet trainingSet = EncogUtility.loadEGB2Memory(trainingFile);
// train the neural network
EncogUtility.trainConsole(network, trainingSet, Config.TRAINING_MINUTES);
System.out.println("Final Error: " + (float) network.calculateError(trainingSet));
System.out.println("Training complete, saving network.");
EncogDirectoryPersistence.saveObject(networkFile, network);
System.out.println("Network saved.");
Encog.getInstance().shutdown();
}
private BasicNetwork createNetwork() {
BasicNetwork network = new BasicNetwork();
network.addLayer(new FeedforwardLayer(2));
network.addLayer(new FeedforwardLayer(3));
network.addLayer(new FeedforwardLayer(1));
network.reset();
return network;
}
public void testClone() throws Throwable {
BasicNetwork source = XOR.createThreeLayerNet();
source.reset();
BasicNetwork target = (BasicNetwork) source.clone();
TestCase.assertTrue(target.equals(source));
}
public static BasicNetwork generateNetwork() {
final BasicNetwork network = new BasicNetwork();
network.addLayer(new BasicLayer(MultiBench.INPUT_COUNT));
network.addLayer(new BasicLayer(MultiBench.HIDDEN_COUNT));
network.addLayer(new BasicLayer(MultiBench.OUTPUT_COUNT));
network.getStructure().finalizeStructure();
network.reset();
return network;
}
public void loadAndEvaluate() {
System.out.println("Loading network");
final EncogPersistedCollection encog = new EncogPersistedCollection(FILENAME);
BasicNetwork network = (BasicNetwork) encog.find("network");
NeuralDataSet trainingSet = new BasicNeuralDataSet(XOR_INPUT, XOR_IDEAL);
double e = network.calculateError(trainingSet);
System.out.println("Loaded network's error is(should be same as above): " + e);
}
public void testAnalyze() {
BasicNetwork network = EncogUtility.simpleFeedForward(2, 2, 0, 1, false);
double[] weights = new double[network.encodedArrayLength()];
EngineArray.fill(weights, 1.0);
network.decodeFromArray(weights);
AnalyzeNetwork analyze = new AnalyzeNetwork(network);
Assert.assertEquals(weights.length, analyze.getWeightsAndBias().getSamples());
Assert.assertEquals(3, analyze.getBias().getSamples());
Assert.assertEquals(6, analyze.getWeights().getSamples());
}
@Override
public void randomize(MLMethod method) {
if (!(method instanceof BasicNetwork)) {
throw new EncogError("Nguyen-Widrow only supports BasicNetwork.");
}
BasicNetwork network = (BasicNetwork) method;
for (int fromLayer = 0; fromLayer < network.getLayerCount() - 1; fromLayer++) {
randomizeSynapse(network, fromLayer);
}
}
@BeforeTest
public void setup() {
network = new BasicNetwork();
network.addLayer(new BasicLayer(DTrainTest.INPUT_COUNT));
network.addLayer(new BasicLayer(DTrainTest.HIDDEN_COUNT));
network.addLayer(new BasicLayer(DTrainTest.OUTPUT_COUNT));
network.getStructure().finalizeStructure();
network.reset();
weights = network.getFlat().getWeights();
training = RandomTrainingFactory.generate(1000, 10000, INPUT_COUNT, OUTPUT_COUNT, -1, 1);
}
public void performEvaluate() {
try {
EvaluateDialog dialog = new EvaluateDialog(EncogWorkBench.getInstance().getMainWindow());
if (dialog.process()) {
BasicNetwork network = dialog.getNetwork();
NeuralDataSet training = dialog.getTrainingSet();
double error = network.calculateError(training);
EncogWorkBench.displayMessage("Error For this Network", "" + Format.formatPercent(error));
}
} catch (Throwable t) {
EncogWorkBench.displayError("Error Evaluating Network", t);
}
}
/**
* Update the velocity, position and personal best position of a particle
*
* @param particleIndex index of the particle in the swarm
* @param init if true, the position and velocity will be initialised.
*/
protected void updateParticle(int particleIndex, boolean init) {
int i = particleIndex;
double[] particlePosition = null;
if (init) {
// Create a new particle with random values.
// Except the first particle which has the same values
// as the network passed to the algorithm.
if (m_networks[i] == null) {
m_networks[i] = (BasicNetwork) m_bestNetwork.clone();
if (i > 0) m_randomizer.randomize(m_networks[i]);
}
particlePosition = getNetworkState(i);
m_bestVectors[i] = particlePosition;
// randomise the velocity
m_va.randomise(m_velocities[i], m_maxVelocity);
} else {
particlePosition = getNetworkState(i);
updateVelocity(i, particlePosition);
// velocity clamping
m_va.clampComponents(m_velocities[i], m_maxVelocity);
// new position (Xt = Xt-1 + Vt)
m_va.add(particlePosition, m_velocities[i]);
// pin the particle against the boundary of the search space.
// (only for the components exceeding maxPosition)
m_va.clampComponents(particlePosition, m_maxPosition);
setNetworkState(i, particlePosition);
}
updatePersonalBestPosition(i, particlePosition);
}
/**
* Generate the RSOM network.
*
* @return The neural network.
*/
public BasicNetwork generate() {
final Layer input = new BasicLayer(new ActivationLinear(), false, this.inputNeurons);
final Layer output = new BasicLayer(new ActivationLinear(), false, this.outputNeurons);
int y = PatternConst.START_Y;
final BasicNetwork network = new BasicNetwork(new SOMLogic());
network.addLayer(input);
network.addLayer(output);
input.setX(PatternConst.START_X);
output.setX(PatternConst.START_X);
input.setY(y);
y += PatternConst.INC_Y;
output.setY(y);
network.getStructure().finalizeStructure();
network.reset();
return network;
}
public void calculateWeights(BasicNetwork network) {
int n1, n2, n3, n4;
int i, j;
int predN3, succN3;
double weight;
BoltzmannLogic logic = (BoltzmannLogic) network.getLogic();
for (n1 = 0; n1 < NUM_CITIES; n1++) {
for (n2 = 0; n2 < NUM_CITIES; n2++) {
i = n1 * NUM_CITIES + n2;
for (n3 = 0; n3 < NUM_CITIES; n3++) {
for (n4 = 0; n4 < NUM_CITIES; n4++) {
j = n3 * NUM_CITIES + n4;
weight = 0;
if (i != j) {
predN3 = (n3 == 0 ? NUM_CITIES - 1 : n3 - 1);
succN3 = (n3 == NUM_CITIES - 1 ? 0 : n3 + 1);
if ((n1 == n3) || (n2 == n4)) weight = -gamma;
else if ((n1 == predN3) || (n1 == succN3)) weight = -distance[n2][n4];
}
logic.getThermalSynapse().getMatrix().set(i, j, weight);
}
}
logic.getThermalLayer().setThreshold(i, -gamma / 2);
}
}
}
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));
}
public void run() {
BoltzmannPattern pattern = new BoltzmannPattern();
pattern.setInputNeurons(NEURON_COUNT);
BasicNetwork network = pattern.generate();
BoltzmannLogic logic = (BoltzmannLogic) network.getLogic();
createCities();
calculateWeights(network);
logic.setTemperature(100);
do {
logic.establishEquilibrium();
System.out.println(logic.getTemperature() + " : " + displayTour(logic.getCurrentState()));
logic.decreaseTemperature(0.99);
} while (!isValidTour(logic.getCurrentState()));
System.out.println("Final Length: " + this.lengthOfTour(logic.getCurrentState()));
}
public PredictSIN() {
this.setTitle("SIN Wave Predict");
this.setSize(640, 480);
Container content = this.getContentPane();
content.setLayout(new BorderLayout());
content.add(graph = new GraphPanel(), BorderLayout.CENTER);
network = EncogUtility.simpleFeedForward(INPUT_WINDOW, PREDICT_WINDOW * 2, 0, 1, true);
network.reset();
graph.setNetwork(network);
this.trainingData = generateTraining();
this.train = new ResilientPropagation(this.network, this.trainingData);
btnTrain = new JButton("Train");
this.btnTrain.addActionListener(this);
content.add(btnTrain, BorderLayout.SOUTH);
graph.setError(network.calculateError(this.trainingData));
}
/**
* Use an array to populate the memory of the neural network.
*
* @param array An array of doubles.
* @param network The network to encode.
*/
public static void arrayToNetwork(final double[] array, final BasicNetwork network) {
int index = 0;
for (final Layer layer : network.getStructure().getLayers()) {
if (layer.hasBias()) {
// process layer bias
for (int i = 0; i < layer.getNeuronCount(); i++) {
layer.setBiasWeight(i, array[index++]);
}
}
if (network.getStructure().isConnectionLimited()) {
index = NetworkCODEC.processSynapseLimited(network, layer, array, index);
} else {
index = NetworkCODEC.processSynapseFull(network, layer, array, index);
}
}
}
public void recognizer(List<File> files) {
FeatureExtractor fe = new FeatureExtractor();
MLDataSet trainingSet = new BasicMLDataSet();
for (File f : files) {
// System.out.println(f.getAbsolutePath());
List<double[]> data;
try {
data = fe.fileProcessor(f);
MLData mldataIn = new BasicMLData(data.get(0));
double[] out = new double[NUM_OUT];
Integer index = new Integer(Labeler.getLabel(f));
// System.out.println(index+""+data.get(0));
out[index] = 1.;
System.out.println(out.toString());
MLData mldataout = new BasicMLData(out);
trainingSet.add(mldataIn, mldataout);
} catch (FileNotFoundException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
}
BasicNetwork network = new BasicNetwork();
network.addLayer(new BasicLayer(NUM_IN));
network.addLayer(new BasicLayer(new ActivationSigmoid(), true, 4 * NUM_IN));
// network.addLayer(new BasicLayer(new ActivationSigmoid(), true, 2 * NUM_IN));
network.addLayer(new BasicLayer(new ActivationSigmoid(), false, NUM_OUT));
network.getStructure().finalizeStructure();
network.reset();
// train the neural network
ResilientPropagation train = new ResilientPropagation(network, trainingSet);
System.out.println("Training Set: " + trainingSet.size());
int epoch = 1;
do {
train.iteration();
System.out.println("Epoch:" + epoch + " Error-->" + train.getError());
epoch++;
} while (train.getError() > 0.001);
train.finishTraining();
// test the neural network
System.out.println("Neural Network Results:");
for (MLDataPair pair : trainingSet) {
final MLData output = network.compute(pair.getInput());
System.out.println(
"actual-->" + Labeler.getWord(output) + ", ideal-->" + Labeler.getWord(pair.getIdeal()));
}
Encog.getInstance().shutdown();
}
/**
* Save the specified object.
*
* @param object The node to load from.
* @param hd The XML object.
*/
public void save(final EncogPersistedObject object, final TransformerHandler hd) {
try {
final AttributesImpl atts = EncogPersistedCollection.createAttributes(object);
final BasicNetwork network = (BasicNetwork) object;
hd.startElement("", "", network.getClass().getSimpleName(), atts);
hd.startElement("", "", "layers", atts);
for (final Layer layer : network.getLayers()) {
if (layer instanceof EncogPersistedObject) {
final EncogPersistedObject epo = (EncogPersistedObject) layer;
final Persistor persistor =
EncogPersistedCollection.createPersistor(layer.getClass().getSimpleName());
persistor.save(epo, hd);
}
}
hd.endElement("", "", "layers");
hd.endElement("", "", network.getClass().getSimpleName());
} catch (final SAXException e) {
throw new NeuralNetworkError(e);
}
}
private BasicNetwork getNetwork(ExampleSet exampleSet) throws OperatorException {
BasicNetwork network = new BasicNetwork();
// input layer
network.addLayer(new FeedforwardLayer(exampleSet.getAttributes().size()));
// hidden layers
log("No hidden layers defined. Using default hidden layers.");
int layerSize = getParameterAsInt(PARAMETER_DEFAULT_HIDDEN_LAYER_SIZE);
if (layerSize <= 0) layerSize = getDefaultLayerSize(exampleSet);
for (int p = 0; p < getParameterAsInt(PARAMETER_DEFAULT_NUMBER_OF_HIDDEN_LAYERS); p++) {
network.addLayer(new FeedforwardLayer(layerSize));
}
// output layer
if (exampleSet.getAttributes().getLabel().isNominal()) {
network.addLayer(new FeedforwardLayer(new ActivationSigmoid(), 1));
} else {
network.addLayer(new FeedforwardLayer(new ActivationLinear(), 1));
}
network.reset(
RandomGenerator.getRandomGenerator(
getParameterAsBoolean(RandomGenerator.PARAMETER_USE_LOCAL_RANDOM_SEED),
getParameterAsInt(RandomGenerator.PARAMETER_LOCAL_RANDOM_SEED)));
return network;
}
public void trainAndSave() {
System.out.println("Training XOR network to under 1% error rate.");
BasicNetwork network = new BasicNetwork();
network.addLayer(new BasicLayer(2));
network.addLayer(new BasicLayer(2));
network.addLayer(new BasicLayer(1));
network.getStructure().finalizeStructure();
network.reset();
NeuralDataSet trainingSet = new BasicNeuralDataSet(XOR_INPUT, XOR_IDEAL);
// train the neural network
final Train train = new ResilientPropagation(network, trainingSet);
do {
train.iteration();
} while (train.getError() > 0.009);
double e = network.calculateError(trainingSet);
System.out.println("Network traiined to error: " + e);
System.out.println("Saving network");
final EncogPersistedCollection encog = new EncogPersistedCollection(FILENAME);
encog.create();
encog.add("network", network);
}
/**
* Save the specified object.
*
* @param networkNode The node to load from.
* @return The loaded object.
*/
public EncogPersistedObject load(final Element networkNode) {
final BasicNetwork network = new BasicNetwork();
final String name = networkNode.getAttribute("name");
final String description = networkNode.getAttribute("description");
network.setName(name);
network.setDescription(description);
final Element layers = XMLUtil.findElement(networkNode, "layers");
for (Node child = layers.getFirstChild(); child != null; child = child.getNextSibling()) {
if (!(child instanceof Element)) {
continue;
}
final Element node = (Element) child;
final Persistor persistor = EncogPersistedCollection.createPersistor(node.getNodeName());
if (persistor != null) {
network.addLayer((Layer) persistor.load(node));
}
}
return network;
}
/**
* Create a simple feedforward neural network.
*
* @param input The number of input neurons.
* @param hidden1 The number of hidden layer 1 neurons.
* @param hidden2 The number of hidden layer 2 neurons.
* @param output The number of output neurons.
* @param tanh True to use hyperbolic tangent activation function, false to use the sigmoid
* activation function.
* @return The neural network.
*/
public static BasicNetwork simpleFeedForward(
final int input, final int hidden1, final int hidden2, final int output, final boolean tanh) {
final FeedForwardPattern pattern = new FeedForwardPattern();
pattern.setInputNeurons(input);
pattern.setOutputNeurons(output);
if (tanh) {
pattern.setActivationFunction(new ActivationTANH());
} else {
pattern.setActivationFunction(new ActivationSigmoid());
}
if (hidden1 > 0) {
pattern.addHiddenLayer(hidden1);
}
if (hidden2 > 0) {
pattern.addHiddenLayer(hidden2);
}
final BasicNetwork network = (BasicNetwork) pattern.generate();
network.reset();
return network;
}
/**
* Process a partially connected synapse.
*
* @param network The network to process.
* @param layer The layer to process.
* @param array The array to process.
* @param index The current index.
* @return The index after this synapse has been read.
*/
private static int processSynapseLimited(
final BasicNetwork network, final Layer layer, final double[] array, final int index) {
int result = index;
// process synapses
for (final Synapse synapse : network.getStructure().getPreviousSynapses(layer)) {
if (synapse.getMatrix() != null) {
// process each weight matrix
for (int x = 0; x < synapse.getToNeuronCount(); x++) {
for (int y = 0; y < synapse.getFromNeuronCount(); y++) {
final double oldValue = synapse.getMatrix().get(y, x);
double value = array[result++];
if (Math.abs(oldValue) < network.getStructure().getConnectionLimit()) {
value = 0;
}
synapse.getMatrix().set(y, x, value);
}
}
}
}
return result;
}
@Override
protected BasicNetwork createNetwork() {
BasicNetwork network = new BasicNetwork();
network.addLayer(new BasicLayer(null, true, 22));
network.addLayer(new BasicLayer(new ActivationSigmoid(), false, 30));
network.addLayer(new BasicLayer(new ActivationSigmoid(), false, 3));
network.addLayer(new BasicLayer(null, false, 15));
network.getStructure().finalizeStructure();
network.reset();
return network;
}
