public void Update()
{
IEnumerable <CoefficientDisplayModel> coefficientDisplayModels = facade.GetAll();
Coefficients.Clear();
foreach (CoefficientDisplayModel coefficientDisplayModel in coefficientDisplayModels)
{
Coefficients.Add(coefficientDisplayModel);
}
}
public void Solve()
{
var epochsCount = 1900;
var learningRate = Entities.Average(e => Math.Abs(e.TargetValue)) / 3000;
var batchSize = Math.Min(20, EntitiesCount);
//Coefficients.AddRange(new double[FeaturesCount + 1]);
var random = new Random();
for (int i = 0; i < FeaturesCount + 1; i++)
{
Coefficients.Add(random.NextDouble());
}
for (int epochNumber = 1; epochNumber < epochsCount + 1; epochNumber++)
{
var batch = Entities.OrderBy(e => random.NextDouble()).Take(batchSize).ToList();
//var sumError = 0d;
foreach (var entity in batch)
{
var predictedValue = Predict(entity.NormalizedFeatures);
var error = predictedValue - entity.TargetValue;
//sumError += Math.Pow(error, 2);
for (int i = 0; i < FeaturesCount; i++)
{
Coefficients[i] -= learningRate * error * entity.NormalizedFeatures[i];
}
Coefficients[FeaturesCount] -= learningRate * error;
}
//Console.WriteLine($"Epoch: {epochNumber}\tError = {sumError}");
//foreach (var coefficient in Coefficients)
//{
// Console.Write($"{coefficient} ");
//}
//Console.WriteLine();
//Console.WriteLine();
}
Denormalize();
}
public void ConvertByteArrayToCoefficients(BitArray array)
{
Coefficients.Clear();
for (int i = 0; i < _degree + 1; i++)
{
byte[] coefficientArr = array.ToByteArray().Skip(i * sizeof(double)).Take(sizeof(double)).ToArray();
double value = BitConverter.ToDouble(array.ToByteArray(), i * sizeof(double));
while (double.IsNaN(value))
{
// Console.WriteLine(string.Concat(array.Cast<bool>().Select(Convert.ToByte)));
//Console.WriteLine(coefficientArr.ToBinaryString());
array.Set((i + 1) * sizeof(double) * 8 - _randomProvider.Next(17) - 1, false);
coefficientArr = array.ToByteArray().Skip(i * sizeof(double)).Take(sizeof(double)).ToArray();
value = BitConverter.ToDouble(array.ToByteArray(), i * sizeof(double));
}
Coefficients.Add(value);
}
}