public NeuralNetworkOperations(int characterSize)
{
neuralNet = new ActivationNetwork(new BipolarSigmoidFunction(2.0f), characterSize, 400, characterCount);
neuralNet.Randomize();
teacher = new AForge.Neuro.Learning.BackPropagationLearning(neuralNet);
teacher.LearningRate = 0.5f;
teacher.Momentum = 0.1f;
prepareDataForTeacher();
//var letters = treningLetterListInput.Zip(treningLetterListOutput, (i,o) => new { treningLetterListInput = i, treningLetterListOutput = o });
double err = 400.0f;
int count = 0;
while(err >= 30.0f)
{
err = teacher.RunEpoch(treningLetterListInput.ToArray(), treningLetterListOutput.ToArray());
count++;
}
}
static void Learn()
{
var network = new ActivationNetwork(
new SigmoidFunction(),
baseMaker.InputSize,
arguments.NeuronsCount,
baseMaker.OutputSize
);
network.Randomize();
foreach (var l in network.Layers)
foreach (var n in l.Neurons)
for (int i = 0; i < n.Weights.Length; i++)
n.Weights[i] = rnd.NextDouble() * 2 - 1;
var teacher = new BackPropagationLearning(network);
teacher.LearningRate = 1;
teacher.Momentum = 0;
while (true)
{
var watch = new Stopwatch();
watch.Start();
while (watch.ElapsedMilliseconds < 500)
{
teacher.RunEpoch(baseMaker.Inputs, baseMaker.Answers);
}
watch.Stop();
var count = 0;
percentage = new double[baseMaker.OutputSize, baseMaker.OutputSize];
for (int i = 0; i < baseMaker.OutputSize; i++)
for (int j = 0; j < baseMaker.OutputSize * 5; j++)
{
var task = baseMaker.GenerateRandom(i);
var output = network.Compute(task);
var max = output.Max();
var maxIndex = Enumerable.Range(0, output.Length).Where(z => output[z] == max).First();
percentage[i, maxIndex]++;
if (i != maxIndex) totalErrors++;
count++;
}
var maxPercentage = percentage.Cast<double>().Max();
for (int i = 0; i < baseMaker.OutputSize; i++)
for (int j = 0; j < baseMaker.OutputSize; j++)
percentage[i, j] /= maxPercentage;
totalErrors /= count;
form.BeginInvoke(new Action(Update));
}
}
public static void Optimize(
FsdParser inputParser, string outputFileName,
int[][] layers,
double minThreshold, double maxThreshold, double thresholdStepSize,
int minTrades,
int iterations,
int randomize,
FsdParser[] validationParsers)
{
HashSet<int[]> layerCombinations;
getLayerCombinations(layers, out layerCombinations);
Network bestNetwork = null;
double bestThreshold = double.NaN;
double bestMinWinRate = double.NegativeInfinity;
int cursorLeft = Console.CursorLeft;
int cursorTop = Console.CursorTop;
int numTotalIterations = (int)(layerCombinations.Count * ((maxThreshold - minThreshold) / thresholdStepSize + 1) * iterations);
int numIterations = 0;
foreach (int[] layerCombination in layerCombinations)
{
ActivationNetwork network = new ActivationNetwork(
new SigmoidFunction(),
inputParser.InputVectors[0].Length,
layerCombination);
network.Randomize();
ParallelResilientBackpropagationLearning teacher = new ParallelResilientBackpropagationLearning(network);
for (double threshold = minThreshold; threshold <= maxThreshold; threshold += thresholdStepSize)
{
for (int iteration = 1; iteration <= iterations; iteration++)
{
numIterations++;
Console.CursorLeft = cursorLeft;
Console.CursorTop = cursorTop;
Console.Write(new string(' ', Console.BufferWidth * 10));
Console.CursorLeft = cursorLeft;
Console.CursorTop = cursorTop;
Console.Write("layerCombination[]: { ");
for (int layerComponentIdx = 0; layerComponentIdx < layerCombination.Length; layerComponentIdx++)
{
Console.Write(layerCombination[layerComponentIdx]);
if (layerComponentIdx < layerCombination.Length - 1)
Console.Write(", ");
}
Console.WriteLine(" }");
Console.WriteLine("threshold: {0:0.00}", threshold);
Console.WriteLine("iteration: {0}", iteration);
Console.WriteLine("bestMinWinRate: {0:0.00}%", bestMinWinRate);
Console.WriteLine("");
Console.WriteLine("Progress: {0:0.00}%", (double)numIterations / numTotalIterations * 100.0);
if (randomize > 0 && (iteration - 1) % randomize == 0)
network.Randomize();
teacher.RunEpoch(inputParser.InputVectors, inputParser.OutputVectors);
bool validData = true;
double minWinRate = double.PositiveInfinity;
foreach (FsdParser validationParser in validationParsers)
{
int numTradesWon, numTradesLost;
double tradeWinRate;
getStatistics(network, validationParser, threshold, out numTradesWon, out numTradesLost, out tradeWinRate);
if (numTradesWon + numTradesLost < minTrades)
{
validData = false;
break;
}
minWinRate = Math.Min(minWinRate, tradeWinRate);
if (minWinRate < bestMinWinRate)
{
validData = false;
break;
}
}
if (validData)
{
bestNetwork = network;
bestThreshold = threshold;
bestMinWinRate = minWinRate;
network.Save(outputFileName);
// Konfigurationsinformationen speichern
string configuration = "";
configuration += "layerCombination[]: { ";
for (int layerComponentIdx = 0; layerComponentIdx < layerCombination.Length; layerComponentIdx++)
{
configuration += layerCombination[layerComponentIdx];
if (layerComponentIdx < layerCombination.Length - 1)
configuration += ", ";
}
configuration += " }\r\n";
configuration += string.Format("threshold: {0:0.00}\r\n", threshold);
configuration += string.Format("iteration: {0}\r\n", iteration);
configuration += string.Format("bestMinWinRate: {0:0.00}%\r\n", bestMinWinRate);
File.WriteAllText(outputFileName + ".txt", configuration);
}
}
}
}
}
public void Train(List<Session> train, List<Session> cv, out List<double> trainErrors, out List<double> cvErrors, IActivationFunction function)
{
trainErrors = new List<double>();
cvErrors = new List<double>();
var count = train.Count;
// prepare learning data
Console.WriteLine("prepare learning data");
double[][] input = new double[count][];
double[][] output = new double[count][];
// preparing the data
for (int i = 0; i < count; i++)
{
input[i] = CreateInput(train[i]);
output[i] = CreateOutput(train[i]);
}
Console.WriteLine("feature scaling");
mean = new double[inputSize];
dev = new double[inputSize];
for (int i = 0; i < inputSize; i++)
{
var query = input.Select(p => p[i]);
mean[i] = query.Average();
dev[i] = query.Deviation(mean[i]);
}
for (int i = 0; i < count; i++)
for (int j = 0; j < inputSize; j++)
{
input[i][j] = (input[i][j] - mean[j]) / dev[j];
}
Console.WriteLine("prepare cv data");
// prepare cv data
double[][] cvIn = new double[cv.Count][];
double[][] cvOut = new double[cv.Count][];
// preparing the data
for (int i = 0; i < cv.Count; i++)
{
cvIn[i] = CreateInput(cv[i]);
cvOut[i] = CreateOutput(cv[i]);
}
Console.WriteLine("cv feature scaling");
for (int i = 0; i < cv.Count; i++)
cvIn[i] = ScaleInput(cvIn[i]);
Console.WriteLine("create network");
// create perceptron
_network = new ActivationNetwork(function, inputSize, inputSize, classesCount);
_network.Randomize();
// create teacher
//PerceptronLearning teacher = new PerceptronLearning(_network);
BackPropagationLearning teacher = new BackPropagationLearning(_network);
// set learning rate
teacher.LearningRate = 0.01;
// loop
int iter = 0;
double error = 999;
double delta = 999;
Console.WriteLine("Train Network");
//while (iter < 1000)
while (delta > 1 && iter < 5000)
//while (iter < 2000)
{
// run epoch of learning procedure
double trainError = teacher.RunEpoch(input, output);
double trainError2 = ComputeCVError(_network, input, output);
double cvError = ComputeCVError(_network, cvIn, cvOut);
delta = Math.Abs(error - trainError);
error = trainError;
trainErrors.Add(trainError2);
cvErrors.Add(cvError);
iter++;
if (iter % 100 == 0)
Console.WriteLine(iter);
}
Console.WriteLine(iter);
}
/// <summary>
/// Background worker for neural network learning
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void backgroundWorkerNeural_DoWork(object sender, DoWorkEventArgs e)
{
string connectionString = "Data Source=192.168.0.245;Initial Catalog=MyDB;Integrated Security=True; Connection Timeout=30000";// +
using (SqlConnection connection = new SqlConnection(connectionString))
{
try
{
connection.Open();
string queryString = "SELECT * FROM rates WHERE [i1]<>0 AND [i2]<>0 AND [i3]<>0 AND [i4]<>0 AND [i5]<>0 AND [i6]<>0 AND [i7]<>0 AND [i8]<>0" +
" AND [i9]<>0 AND [i10]<>0 AND [i11]<>0 AND [i12]<>0 AND [i13]<>0 AND [i14]<>0 AND [i15]<>0 AND [i16]<>0" +
" AND [i17]<>0 AND [i18]<>0 AND [i20]<>0 AND [i21]<>0 AND [i23]<>0";
SqlCommand command = new SqlCommand(queryString, connection);
SqlDataReader reader = command.ExecuteReader();
DataTable dt = new DataTable();
dt.Load(reader);
int value_count = dt.Rows.Count;
double[][] input_arr = new double[value_count][];
double[][] output_arr = new double[value_count][];
for (int j = 0; j < value_count; j++)
{
input_arr[j] = new double[21];
output_arr[j] = new double[1];
}
// Call Read before accessing data.
for (int i = 0; i < value_count; i++)
{
DataRow row = dt.Rows[i];
input_arr[i][0] = Double.Parse(row["i1"].ToString());
input_arr[i][1] = Double.Parse(row["i2"].ToString());
input_arr[i][2] = Double.Parse(row["i3"].ToString());
input_arr[i][3] = Double.Parse(row["i4"].ToString());
input_arr[i][4] = Double.Parse(row["i5"].ToString());
input_arr[i][5] = Double.Parse(row["i6"].ToString());
input_arr[i][6] = Double.Parse(row["i7"].ToString());
input_arr[i][7] = Double.Parse(row["i8"].ToString());
input_arr[i][8] = Double.Parse(row["i9"].ToString());
input_arr[i][9] = Double.Parse(row["i10"].ToString());
input_arr[i][10] = Double.Parse(row["i11"].ToString());
input_arr[i][11] = Double.Parse(row["i12"].ToString());
input_arr[i][12] = Double.Parse(row["i13"].ToString());
input_arr[i][13] = Double.Parse(row["i14"].ToString());
input_arr[i][14] = Double.Parse(row["i15"].ToString());
input_arr[i][15] = Double.Parse(row["i16"].ToString());
input_arr[i][16] = Double.Parse(row["i17"].ToString());
input_arr[i][17] = Double.Parse(row["i18"].ToString());
input_arr[i][18] = Double.Parse(row["i20"].ToString());
input_arr[i][19] = Double.Parse(row["i21"].ToString());
input_arr[i][20] = Double.Parse(row["i23"].ToString());
//output_arr[i][0] = Double.Parse(row["Difference"].ToString());
if (Double.Parse(row["Difference"].ToString()) > 0)
output_arr[i][0] = 1;
else if (Double.Parse(row["Difference"].ToString()) == 0)
output_arr[i][0] = 0;
else
output_arr[i][0] = -1;
}
int[] neurons = new int[5] { 21, 21, 21, 21, 1 };
AForge.Neuro.BipolarSigmoidFunction sigmoiddFunction = new AForge.Neuro.BipolarSigmoidFunction();
//AForge.Neuro.SigmoidFunction sigmoiddFunction = new AForge.Neuro.SigmoidFunction(2);
AForge.Neuro.ActivationNetwork network = new AForge.Neuro.ActivationNetwork(sigmoiddFunction, 21, 1);
AForge.Neuro.ActivationNetwork network1 = new AForge.Neuro.ActivationNetwork(sigmoiddFunction, 21, 1);//neurons);
//AForge.Neuro.Learning.DeltaRuleLearning teacher = new AForge.Neuro.Learning.DeltaRuleLearning(network) { LearningRate = 1};
AForge.Neuro.Learning.EvolutionaryLearning teacher = new AForge.Neuro.Learning.EvolutionaryLearning(network, 1000);
// AForge.Neuro.Learning.ResilientBackpropagationLearning teacher = new AForge.Neuro.Learning.ResilientBackpropagationLearning(network) { LearningRate = 1 };
//AForge.Neuro.Learning.PerceptronLearning teacherP = new PerceptronLearning(network1){ LearningRate =1};
//AForge.Neuro.Learning.BackPropagationLearning teacher = new AForge.Neuro.Learning.BackPropagationLearning(network) { LearningRate =1, Momentum = .2 };
// loop
bool noNeedToStop = false;
double error = 0;
//double error1 = 0;
double lastError = 0;
double learningRate = 1;
int k = 0;
sigmoiddFunction.Alpha = 0.01;
while (!noNeedToStop)
{
// run epoch of learning procedure
//error = teacher.RunEpoch(input_arr, output_arr);
//error = teacherP.RunEpoch(input_arr,output_arr);
error = teacher.RunEpoch(input_arr, output_arr);
double temp = Math.Abs(lastError - error);
if (error < 30)
noNeedToStop = true;
else if (temp < 0.0000001)
{
lastError = error;
k++;
if (k > 1000)
{
network.Randomize();
k = 0;
}
learningRate /= 2;
//if (learningRate < 0.001)
// {
// learningRate = 0.001;
//network.Randomize();
// noNeedToStop = true;
// }
}
else
lastError = error;
// teacherP.LearningRate = learningRate;
}
network.Save(@"E:\\neural");
}
catch (Exception ex)
{
message += " Exception: " + ex.Message;
}
finally
{
connection.Close();
}
}
}
//Train the network many times, with different initial values, evaluate them on the cross valiadtion data and select the best one
private static ActivationNetwork trainNetworksCompeteOnCrossValidation(ActivationNetwork neuralNet, ISupervisedLearning teacher,
double[][] input, double[][] output, double[][] crossValidationInput, char[] crossValidationDataLabels)
{
DefaultLog.Info("Training {0} neural networks & picking the one that performs best on the cross-validation data . . .",
NUM_NETWORKS_TO_TRAIN_FOR_CROSS_VALIDATION_COMPETITION);
MemoryStream bestNetworkStream = new MemoryStream();
uint bestNetworkNumMisclassified = uint.MaxValue;
for (int i = 0; i < NUM_NETWORKS_TO_TRAIN_FOR_CROSS_VALIDATION_COMPETITION; i++)
{
DefaultLog.Info("Training network {0}/{1}", (i + 1), NUM_NETWORKS_TO_TRAIN_FOR_CROSS_VALIDATION_COMPETITION);
//Train a new network
neuralNet.Randomize(); //Reset the weights to random values
trainNetwork(neuralNet, teacher, input, output, crossValidationInput, crossValidationDataLabels);
//Compare this new networks performance to our current best network
NeuralNetworkEvaluator evaluator = new NeuralNetworkEvaluator(neuralNet);
evaluator.Evaluate(crossValidationInput, crossValidationDataLabels);
uint numMisclassified = evaluator.ConfusionMatrix.NumMisclassifications;
if (numMisclassified < bestNetworkNumMisclassified)
{
//This network performed better than out current best network, make this the new best
//Clear the Memory Stream storing the current best network
bestNetworkStream.SetLength(0);
//Save the network & update the best numMisclassified
neuralNet.Save(bestNetworkStream);
bestNetworkNumMisclassified = numMisclassified;
}
}
DefaultLog.Info("Trained all networks and selected the best one");
//Load up the network that performed best
bestNetworkStream.Position = 0; //Read from the start of the stream
ActivationNetwork bestNetwork = ActivationNetwork.Load(bestNetworkStream) as ActivationNetwork;
return bestNetwork;
}
private static NeuralNetworkEvaluator evaluateSingleLayerActivationNetworkWithSigmoidFunctionBackPropagationLearning(
double[][] input, double[][] output, double[][] crossValidationInput, char[] crossValidationDataLabels,
double[][] evaluationInput, char[] evaluationDataLabels, double learningRate, string networkName)
{
//Create the neural Network
BipolarSigmoidFunction sigmoidFunction = new BipolarSigmoidFunction(2.0f);
ActivationNetwork neuralNet = new ActivationNetwork(sigmoidFunction, input[0].Length, ClassifierHelpers.NUM_CHAR_CLASSES);
//Randomise the networks initial weights
neuralNet.Randomize();
//Create teacher that the network will use to learn the data (Back Propogation Learning technique used here)
BackPropagationLearning teacher = new BackPropagationLearning(neuralNet);
teacher.LearningRate = LEARNING_RATE;
//Train the Network
//trainNetwork(neuralNet, teacher, input, output, crossValidationInput, crossValidationDataLabels);
//Train multiple networks, pick the one that performs best on the Cross-Validation data
neuralNet = trainNetworksCompeteOnCrossValidation(neuralNet, teacher,
input, output, crossValidationInput, crossValidationDataLabels);
//Evaluate the network returned on the cross-validation data so it can be compared to the current best
NeuralNetworkEvaluator crossValEvaluator = new NeuralNetworkEvaluator(neuralNet);
crossValEvaluator.Evaluate(crossValidationInput, crossValidationDataLabels);
//See if this network is better than the current best network of it's type
//Try and load a previous network of this type
string previousNetworkPath = Program.NEURAL_NETWORKS_PATH + networkName + Program.NEURAL_NETWORK_FILE_EXTENSION;
string networkCMPath = Program.NEURAL_NETWORKS_PATH + networkName + ".csv";
bool newBest = false;
ActivationNetwork bestNetwork = neuralNet;
if(File.Exists(previousNetworkPath))
{
//Load the previous network & evaluate it
ActivationNetwork previous = ActivationNetwork.Load(previousNetworkPath) as ActivationNetwork;
NeuralNetworkEvaluator prevCrossValEval = new NeuralNetworkEvaluator(previous);
prevCrossValEval.Evaluate(crossValidationInput, crossValidationDataLabels);
//If this network is better than the previous best, write it out as the new best
if(prevCrossValEval.ConfusionMatrix.NumMisclassifications > crossValEvaluator.ConfusionMatrix.NumMisclassifications)
{
DefaultLog.Info("New best cross-validation score for network \"{0}\". Previous was {1}/{2}, new best is {3}/{2}",
networkName, prevCrossValEval.ConfusionMatrix.NumMisclassifications, prevCrossValEval.ConfusionMatrix.TotalClassifications,
crossValEvaluator.ConfusionMatrix.NumMisclassifications);
//Delete the old files
File.Delete(previousNetworkPath);
File.Delete(networkCMPath);
newBest = true;
}
else //The previous network is still the best
{
DefaultLog.Info("Existing \"{0}\" network performed better than new one. New network scored {1}/{2}, existing scored {3}/{2}",
networkName, crossValEvaluator.ConfusionMatrix.NumMisclassifications, crossValEvaluator.ConfusionMatrix.TotalClassifications,
prevCrossValEval.ConfusionMatrix.NumMisclassifications);
bestNetwork = previous;
}
}
else //Otherwise there isn't a previous best
{
DefaultLog.Info("No previous best record for network \"{0}\" . . .", networkName);
newBest = true;
}
//Evaluate the best system on the evaluation data
NeuralNetworkEvaluator evaluator = new NeuralNetworkEvaluator(bestNetwork);
evaluator.Evaluate(evaluationInput, evaluationDataLabels);
//If there is a new best to write out
if(newBest)
{
DefaultLog.Info("Writing out net best network of type\"{0}\"", networkName);
neuralNet.Save(previousNetworkPath);
//Write out the Confusion Matrix for the evaluation data, not cross-validation
evaluator.ConfusionMatrix.WriteToCsv(networkCMPath);
DefaultLog.Info("Finished writing out network \"{0}\"", networkName);
}
return evaluator;
}