static void Main(string[] args)
{
var normalize = new ValueNormalizer();
var dataTransformer = new DataTransformer();
var dataSupplier = new DataSourceSupplier();
var data = dataSupplier.GetTrainingSet().ToList();
var trainingSet = GetNormalizedData();
var functions = new FunctionsCalculator(trainingSet);
var newHouse = new double[] { 1, 1203, 3 };
double predictedPrice = 0.0;
var actualPrice = 239500;
var theta = new double[] { 89597.9027899082, 504777.895309395, -34952.0620218024 };
for (int i = 1; i <= 2; i++)
{
var featureVector = dataTransformer.GetNthFeatureVector(data, i).ToArray();
var min = featureVector.Min();
var max = featureVector.Max();
newHouse[i] = normalize.FeatureScaling(min, max, newHouse[i]);
}
predictedPrice = functions.Hypothesis(newHouse, theta);
Console.WriteLine($"Actual price: {actualPrice}");
Console.WriteLine($"Predicted price: {predictedPrice}");
Console.Read();
}
private List <DataPoint> GetPlotData()
{
string projectPath = Path.GetDirectoryName(Path.GetDirectoryName(Directory.GetCurrentDirectory()));
string filePath = @"DataSets\theta.txt";
string fullPath = Path.Combine(projectPath, filePath);
var trainingSet = this.GetNormalizedData();
var resultList = new List <DataPoint>();
var functionsCalculator = new FunctionsCalculator(trainingSet);
var gradientDescentCalculator = new GradientDescentCalculator(trainingSet);
double bound = 2043280050.60283;
double alpha = 0.1;
// todo: replace hardcoded number of values with dynamic initialization
var theta = new double[] { 0, 0, 0 };
try
{
double costFunctionResult = functionsCalculator.CostFuction(theta);
int iteration = 1;
resultList.Add(new DataPoint(iteration, costFunctionResult));
do
{
theta = gradientDescentCalculator.Descent(theta, alpha, 3);
costFunctionResult = functionsCalculator.CostFuction(theta);
iteration++;
resultList.Add(new DataPoint(iteration, costFunctionResult));
Console.WriteLine(costFunctionResult);
} while (costFunctionResult > bound);
File.WriteAllText(fullPath, string.Join(" ", theta));
}
catch (Exception e)
{
Console.WriteLine(e.Message);
}
return(resultList);
}
