/// <summary>
/// Save a NetworkTopology to file.
/// </summary>
/// <param name="file">Location to save the file.</param>
/// <param name="topology">The topology to save to file.</param>
/// <exception cref="IOException">System.IO.IOException</exception>
public static void Save(string file, NetworkTopology topology, bool binary = false)
{
if(binary)
SaveBinary(file, ref topology);
else
SaveText(file, ref topology);
}
public void LoadTextTest()
{
SetUpBaseTopology();
testTopology = Topology.Load(
basePath + "testTopology.nnt",
ref objectFactory,
ref settings);
Assert.IsTrue(baseTopology.Equals(testTopology), "Test for logical equality");
Assert.IsNotNull(testTopology.MetaData, "Test for meta data");
}
/// <summary>
/// Calculates a value. Same algorithm as in the neural network clas.
/// </summary>
private float ComputeDecision(ref NetworkTopology topology)
{
float val;
float[] inputPool = topology.PreProcessor.GenerateValues();
topology.InputLayer.SetInputPool(ref inputPool);
float[] layerVals = topology.InputLayer.GetValues();
for (int i = 0; i < topology.HiddenLayers.Length; i++)
{
layerVals = topology.HiddenLayers[i].GetValues(layerVals);
}
val = topology.OutputLayer.GetValue(layerVals);
topology.PostProcessor.FinalAction(val);
return(val);
}
/// <summary>
/// Traines the given network. Same algorithm as in the neural network class.
/// </summary>
private float TrainNetwork(ref NetworkTopology topology)
{
topology.TrainingAlgorithm.SetSettings(settings);
int countSinceTrain = 0;
int maxCountSinceTrain = 40;
if (settings.TraininPool != null &&
settings.TraininPool > 0)
{
maxCountSinceTrain = settings.TraininPool;
}
int trainingIterations = 0;
if (settings.TrainingIterations == -1)
{
trainingIterations = -2;
}
float value;
float expected;
float error;
float average = 0;//average error
while ((1 - average) < settings.TrainingAccuracy &&
trainingIterations < settings.TrainingIterations)
{
average = 0;
while (countSinceTrain < maxCountSinceTrain)
{
value = ComputeDecision(ref topology);
expected = topology.TrainingPreProcessor.ExpectedResult();
error = (expected - value) / expected;
error = Math.Abs(error);
average = average + ((error - average) / (countSinceTrain + 1));
countSinceTrain++;
}
topology.TrainingAlgorithm.TrainNetwork(ref topology, average);
if (settings.TrainingIterations != -1)
{
trainingIterations++;
}
}
return(1 - average);
}
public void SaveLoadBinaryTest()
{
SetUpBaseTopology();
Topology.Save(
basePath + "testBinaryTopologySave.nntc",
baseTopology,
true);
testTopology = Topology.Load(
basePath + "testBinaryTopologySave.nntc",
ref objectFactory,
ref settings,
true);
Assert.IsTrue(baseTopology.Equals(testTopology));
File.Delete(basePath + "testBinaryTopologySave.nntc");
}
/// <summary>
/// Trains the network.
/// </summary>
/// <param name="topology">Reference to the topology object to train.</param>
/// <param name="error">The current error in decimal format of the topology.
/// Example of expected: 0.6</param>
public void TrainNetwork(ref NetworkTopology topology, float error)
{
if (error > priorError)
{
stepValue *= -0.5f;
flips++;
}
if (flips == maxFlips)
{
nodeIndex++;
weightIndex = 0;
stepValue = baseStepValue;
}
if (weightIndex > topology.HiddenLayers[layerIndex].Nodes[nodeIndex].Weights.Length)
{
nodeIndex++;
weightIndex = 0;
stepValue = baseStepValue;
}
if (nodeIndex > topology.HiddenLayers[layerIndex].Nodes.Length)
{
nodeIndex = 0;
weightIndex = 0;
layerIndex++;
stepValue = baseStepValue;
}
if (layerIndex > topology.HiddenLayers.Length)
{
nodeIndex = 0;
layerIndex = 0;
weightIndex = 0;
stepValue = baseStepValue;
}
priorError = error;
topology.HiddenLayers[layerIndex].Nodes[nodeIndex].Weights[weightIndex] += stepValue;
}
/// <summary>
/// Saves the current topology in the GUI.
/// </summary>
private void SaveTopology(object sender, EventArgs e)
{
NetworkTopology topology = new NetworkTopology();
topology.MetaData = topologyMetaData;
List<IHiddenLayer> hiddenLayers = new List<IHiddenLayer>();
foreach (UserControl layer in topologyDisplay.Controls)
{
Type layerType = layer.GetType();
Dictionary<string, string> metaData = ((LayerView)layer).GetMetaData();
if (layerType == typeof(InputLayerView))
{
InputLayerShell inputLayer = new InputLayerShell();
inputLayer.MetaData = metaData;
topology.InputLayer = inputLayer;
}
else if (layerType == typeof(HiddenLayerView))
{
HiddenLayerView view = (HiddenLayerView)layer;
LayerView[] rawNodes = view.GetNodes();
INode[] nodes = new INode[rawNodes.Length];
for (int i = 0; i < rawNodes.Length; i++)
{
NodeShell node = new NodeShell();
node.MetaData = rawNodes[i].GetMetaData();
nodes[i] = node;
}
HiddenLayerShell hiddenLayer = new HiddenLayerShell();
hiddenLayer.MetaData = metaData;
hiddenLayer.Nodes = nodes;
hiddenLayers.Add(hiddenLayer);
}
else if (layerType == typeof(OutputLayerView))
{
OutputLayerShell outputLayer = new OutputLayerShell();
outputLayer.MetaData = metaData;
topology.OutputLayer = outputLayer;
}
else if (layerType == typeof(PreProcessorView))
{
PreProcessorShell preProcessor = new PreProcessorShell();
preProcessor.MetaData = metaData;
topology.PreProcessor = preProcessor;
}
else if (layerType == typeof(PostProcessorView))
{
PostProcessorShell postProcessor = new PostProcessorShell();
postProcessor.MetaData = metaData;
topology.PostProcessor = postProcessor;
}
topology.HiddenLayers = hiddenLayers.ToArray();
saveTopology.ShowDialog();
if (saveTopology.FileName.EndsWith(".nntc"))
{
saveTopology.FileName.Remove(saveTopology.FileName.Length - 1);
}
Topology.Save(saveTopology.FileName, topology);
}
}
/// <summary>
/// Saves a topology to a file in the form of text. Not that the topology must
/// have its meta data properly set or you will not be able to load the topology
/// from the text file. The only way that you can garuntee that the file will
/// save successfully is to have had the topology loaded from a text file at some
/// point in time in the past.
/// </summary>
/// <param name="file">The location of the file</param>
/// <param name="topology">The NetworkTopology object to persist</param>
/// <exception cref="IOException">System.IO.IOException</exception>
private static void SaveText(string file, ref NetworkTopology topology)
{
StreamWriter writer = new StreamWriter(file);
writer.WriteLine("version:1.0");
writer.WriteLine("#Created on {0}", DateTime.Now);
writer.WriteLine();
//Set up topology
writer.WriteLine("#Topology");
writer.WriteLine("topology{");
WriteMeta(ref writer, topology);
writer.WriteLine("}");
writer.WriteLine();
//Add layers
writer.WriteLine("#Topology Layers");
//Input
writer.WriteLine("layer{");
WriteMeta(ref writer, topology.InputLayer);
writer.WriteLine("}");
writer.WriteLine();
//Output
writer.WriteLine("layer{");
WriteMeta(ref writer, topology.OutputLayer);
writer.WriteLine("}");
writer.WriteLine();
//Hidden Layers
foreach (IHiddenLayer hidden in topology.HiddenLayers)
{
writer.WriteLine("layer{");
WriteMeta(ref writer, hidden);
writer.WriteLine("}");
writer.WriteLine();
}
//Add pre/post processors
writer.WriteLine("#Pre and Post processors");
//Pre
writer.WriteLine("preprocessor{");
WriteMeta(ref writer, topology.PreProcessor);
writer.WriteLine("}");
writer.WriteLine();
//Post
writer.WriteLine("postprocessor{");
WriteMeta(ref writer, topology.PostProcessor);
writer.WriteLine("}");
writer.WriteLine();
//Add nodes
writer.WriteLine("#Nodes");
foreach (IHiddenLayer layer in topology.HiddenLayers)
{
foreach (INode node in layer.Nodes)
{
writer.WriteLine("node{");
WriteMeta(ref writer, node);
writer.WriteLine("}");
writer.WriteLine();
}
}
writer.Close();
}
/// <summary>
/// Saves a topology to file in binary format.
/// </summary>
/// <param name="file">Location to save the topology.</param>
/// <param name="topology">The topology object to persist to disk.</param>
/// <exception cref="IOException">System.IO.IOException</exception>
private static void SaveBinary(string file, ref NetworkTopology topology)
{
Stream fs = new FileStream(file, FileMode.OpenOrCreate, FileAccess.Write);
BinaryFormatter binary = new BinaryFormatter();
binary.Serialize(fs, topology);
fs.Close();
}
public NeuralNetwork(NetworkTopology topology, NetworkSettings settings)
{
this.topology = topology;
this.settings = settings;
}
public void SetUp()
{
basePath = "C:\\Development Projects\\ENN\\TestSuite\\TestFiles\\";
objectFactory = new Dictionary<string, IUserObjectFactory>()
{
{"standard", new StandLibFactory()},
{"TestBinary", new TestBinary()}
};
settings = new NetworkSettings();
settings.Mode = NetworkMode.Training;
baseTopology = new NetworkTopology();
}
public EvolvingNeuralNetwork(NetworkTopology[] topologies, NetworkSettings settings)
{
this.topologies = topologies;
this.settings = settings;
}
/// <summary>
/// Traines the given network. Same algorithm as in the neural network class.
/// </summary>
private float TrainNetwork(ref NetworkTopology topology)
{
topology.TrainingAlgorithm.SetSettings(settings);
int countSinceTrain = 0;
int maxCountSinceTrain = 40;
if (settings.TraininPool != null
&& settings.TraininPool > 0)
maxCountSinceTrain = settings.TraininPool;
int trainingIterations = 0;
if (settings.TrainingIterations == -1) trainingIterations = -2;
float value;
float expected;
float error;
float average = 0;//average error
while ((1 - average) < settings.TrainingAccuracy &&
trainingIterations < settings.TrainingIterations)
{
average = 0;
while (countSinceTrain < maxCountSinceTrain)
{
value = ComputeDecision(ref topology);
expected = topology.TrainingPreProcessor.ExpectedResult();
error = (expected - value) / expected;
error = Math.Abs(error);
average = average + ((error - average) / (countSinceTrain + 1));
countSinceTrain++;
}
topology.TrainingAlgorithm.TrainNetwork(ref topology, average);
if (settings.TrainingIterations != -1) trainingIterations++;
}
return 1 - average;
}
/// <summary>
/// Calculates a value. Same algorithm as in the neural network clas.
/// </summary>
private float ComputeDecision(ref NetworkTopology topology)
{
float val;
float[] inputPool = topology.PreProcessor.GenerateValues();
topology.InputLayer.SetInputPool(ref inputPool);
float[] layerVals = topology.InputLayer.GetValues();
for (int i = 0; i < topology.HiddenLayers.Length; i++)
{
layerVals = topology.HiddenLayers[i].GetValues(layerVals);
}
val = topology.OutputLayer.GetValue(layerVals);
topology.PostProcessor.FinalAction(val);
return val;
}
/// <summary>
/// Trains the network.
/// </summary>
/// <param name="topology">Reference to the topology object to train.</param>
/// <param name="error">The current error in decimal format of the topology.
/// Example of expected: 0.6</param>
public void TrainNetwork(ref NetworkTopology topology, float error)
{
if (error > priorError)
{
stepValue *= -0.5f;
flips++;
}
if (flips == maxFlips)
{
nodeIndex++;
weightIndex = 0;
stepValue = baseStepValue;
}
if (weightIndex > topology.HiddenLayers[layerIndex].Nodes[nodeIndex].Weights.Length)
{
nodeIndex++;
weightIndex = 0;
stepValue = baseStepValue;
}
if (nodeIndex > topology.HiddenLayers[layerIndex].Nodes.Length)
{
nodeIndex = 0;
weightIndex = 0;
layerIndex++;
stepValue = baseStepValue;
}
if (layerIndex > topology.HiddenLayers.Length)
{
nodeIndex = 0;
layerIndex = 0;
weightIndex = 0;
stepValue = baseStepValue;
}
priorError = error;
topology.HiddenLayers[layerIndex].Nodes[nodeIndex].Weights[weightIndex] += stepValue;
}
/// <summary>
/// Handles the running and testing of neural networks.
/// </summary>
/// <param name="commands"></param>
private static void RunHandler(List<RawCommand> commands)
{
NetworkTopology topology = new NetworkTopology();
string name = "";
bool test = false;
foreach(RawCommand command in commands)
{
if(command.CommandChar == 't')
{
test = true;
}
else if(command.CommandChar == 'n')
{
name = command.Value;
}
}
if (name == "")
{
Console.WriteLine("Could not process request becuase no name was set");
return;
}
if (topologies.ContainsKey(name))
{
topology = topologies[name];
}
else
{
Console.WriteLine("No topology by the name {0} is loaded", name);
return;
}
if (test)
{
//tests to see is the specified topology is ready to be used.
if (topology.HiddenLayers == null ||
topology.InputLayer == null ||
topology.OutputLayer == null ||
topology.PostProcessor == null ||
topology.PreProcessor == null)
{
Console.WriteLine(
"The network is not ready to run because the" +
"topology is not completely loaded");
return;
}
bool error = false;
int i = 0;
int j = 0;
INode[] nodes;
while(i < topology.HiddenLayers.Length && error == false)
{
nodes = topology.HiddenLayers[i].Nodes;
while (j < nodes.Length && error == false)
{
error = nodes[j] == null;
j++;
}
i++;
}
if (error)
{
Console.WriteLine("The network is not ready to run");
Console.WriteLine("In layer number {0}, node {1} is null", --i, --j);
return;
}
Console.WriteLine("The network is ready to run");
}
else
{
//runs the specified topology
Console.WriteLine("The network is starting...");
NeuralNetwork network = new NeuralNetwork(topology, settings);
ThreadPool.QueueUserWorkItem(network.StartNetwork);
Console.WriteLine("The network was started");
}
}
public override bool Equals(object obj)
{
NetworkTopology other = (NetworkTopology)obj;
if (other == null)
{
return(false);
}
if (preProcessor == null)
{
if (other.PreProcessor != null)
{
return(false);
}
}
else
{
if (!preProcessor.Equals(other.PreProcessor))
{
return(false);
}
}
if (postProcessor == null)
{
if (other.PostProcessor != null)
{
return(false);
}
}
else
{
if (!postProcessor.Equals(other.postProcessor))
{
return(false);
}
}
if (TrainingAlgorithm == null)
{
if (other.TrainingAlgorithm != null)
{
return(false);
}
}
else
{
if (!TrainingAlgorithm.Equals(other.TrainingAlgorithm))
{
return(false);
}
}
if (TrainingPreProcessor == null)
{
if (other.TrainingPreProcessor != null)
{
return(false);
}
}
else
{
if (!TrainingPreProcessor.Equals(other.TrainingPreProcessor))
{
return(false);
}
}
if (inputLayer == null)
{
if (other.InputLayer != null)
{
return(false);
}
}
else
{
if (!inputLayer.Equals(other.InputLayer))
{
return(false);
}
}
if (outputLayer == null)
{
if (other.OutputLayer != null)
{
return(false);
}
}
else
{
if (!outputLayer.Equals(other.OutputLayer))
{
return(false);
}
}
if (hiddenLayers == null)
{
if (other.HiddenLayers != null)
{
return(false);
}
}
else
{
if (!hiddenLayers.Length.Equals(other.HiddenLayers.Length))
{
return(false);
}
for (int i = 0; i < hiddenLayers.Length; i++)
{
if (!hiddenLayers[i].Equals(other.HiddenLayers[i]))
{
return(false);
}
}
}
return(true);
}
public void SaveTextTest()
{
baseTopology = Topology.Load(
basePath + "testTopology.nnt",
ref objectFactory,
ref settings);
Topology.Save(
basePath + "testSaveTopology.nnt",
baseTopology);
testTopology = Topology.Load(
basePath + "testSaveTopology.nnt",
ref objectFactory,
ref settings);
Assert.IsTrue(baseTopology.Equals(testTopology));
File.Delete(basePath + "testSaveTopology.nnt");
}
/// <summary>
/// Creates a NetworkTopology from a text file.
/// </summary>
/// <param name="file">The location of the file to read from.</param>
/// <param name="objectFactories">The object factories that will
/// be used to tranform the text types into objects.</param>
/// <param name="settings">The currently loaded NetworkSettings.</param>
/// <returns>Returns the NetworkTopology located inside of the file.
/// If the file can not be parsed null is returned.</returns>
/// <exception cref="IOException">System.IO.IOException</exception>
private static NetworkTopology LoadText(
string file,
ref Dictionary<string, IUserObjectFactory> objectFactories,
ref NetworkSettings settings)
{
//Check to varify that the file can be loaded.
if (GetVersion(file) != "1.0") return null;
NetworkTopology topology = new NetworkTopology();
//Retrieves the RawTypes from the file
List<RawType> rawTypes = GetRawTypes(file);
Dictionary<string, IHiddenLayer> hiddenLayers = new Dictionary<string, IHiddenLayer>();
//Factory to create the object with
string factoryName;
//Transforms all the rawTypes into objects
for (int i = 0; i < rawTypes.Count; i++)
{
factoryName = settings.DefaultFactory;
if (rawTypes[i].Fields.ContainsKey("factory")) factoryName = rawTypes[i].Fields["factory"];
if (rawTypes[i].Type == "layer")
{
if (rawTypes[i].Fields["type"] == "hidden")
{
hiddenLayers.Add(rawTypes[i].Fields["layerName"],
objectFactories[factoryName].CreateUserObject<IHiddenLayer>(
rawTypes[i].Fields["dataType"],
rawTypes[i].Fields));
}
else if (rawTypes[i].Fields["type"] == "output")
{
topology.OutputLayer =
objectFactories[factoryName].CreateUserObject<IOutputLayer>(
rawTypes[i].Fields["dataType"], rawTypes[i].Fields);
}
else if (rawTypes[i].Fields["type"] == "input")
{
topology.InputLayer =
objectFactories[factoryName].CreateUserObject<IInputLayer>(
rawTypes[i].Fields["dataType"], rawTypes[i].Fields);
}
}
else if (rawTypes[i].Type == "node")
{
INode node = objectFactories[factoryName].CreateUserObject<INode>(
rawTypes[i].Fields["dataType"], rawTypes[i].Fields);
if (hiddenLayers.ContainsKey(rawTypes[i].Fields["layer"]))
{
hiddenLayers[rawTypes[i].Fields["layer"]].SetNode(node, -1);
}
}
else if (rawTypes[i].Type == "preprocessor")
{
topology.PreProcessor =
objectFactories[factoryName].CreateUserObject<IPreProcessor>(
rawTypes[i].Fields["dataType"], rawTypes[i].Fields);
if(settings.Mode == NetworkMode.Training)
topology.TrainingPreProcessor =
objectFactories[factoryName].CreateUserObject<ITrainingPreProcessor>(
rawTypes[i].Fields["dataType"], rawTypes[i].Fields);
}
else if (rawTypes[i].Type == "postprocessor")
{
topology.PostProcessor = objectFactories[factoryName].
CreateUserObject<IPostProcessor>(rawTypes[i].Fields["dataType"], rawTypes[i].Fields);
}
else if (rawTypes[i].Type == "topology")
{
topology.MetaData = rawTypes[i].Fields;
if(!rawTypes[i].Fields.ContainsKey("algorithmFactory"))
{
rawTypes[i].Fields.Add("algorithmFactory", factoryName);
}
topology.TrainingAlgorithm = objectFactories[rawTypes[i].Fields["algorithmFactory"]].
CreateUserObject<ITrainingAlgorithm>(
rawTypes[i].Fields["trainingAlgorithm"],
rawTypes[i].Fields);
}
}
//This tranformation is required because nodes are linked to hidden layers
//by names. The name of the layer is the key in the dictionary.
IHiddenLayer[] layer = new IHiddenLayer[hiddenLayers.Count];
int j = 0;
foreach (KeyValuePair<string, IHiddenLayer> temp in hiddenLayers)
{
layer[j] = temp.Value;
j++;
}
topology.HiddenLayers = layer;
return topology;
}
public NeuralNetwork(NetworkTopology topology, NetworkSettings settings)
{
this.topology = topology;
this.settings = settings;
}
