public static void Main(string[] args)
{
// Step 1: Data
Console.WriteLine("Step 1: Data");
Tennis[] tennis = Tennis.GetData();
var descriptor = Descriptor.Create <Tennis>();
// Step 2: Maths
Console.WriteLine("\nStep 2: Maths");
var data = descriptor.ToExamples(tennis);
var x = data.Item1;
var y = data.Item2;
Console.WriteLine($"Mathematical feature representation:{x}");
Console.WriteLine($"\nMathematical label representation:{y.T}");
// Step 3: Generate Model
Console.WriteLine("\nStep 3: Generate Model");
var generator = new DecisionTreeGenerator();
var model = generator.Generate <Tennis>(descriptor, tennis);
Console.WriteLine(model);
// Step 4: Prediction
Console.WriteLine("\nStep 4: Prediction");
Tennis t = new Tennis
{
Outlook = Outlook.Sunny,
Temperature = Temperature.Hot,
Windy = false
};
Tennis p = model.Predict(t);
Console.WriteLine($"Play: {p.Play}");
// Step 5: Testing Accuracy
Console.WriteLine("\nStep 5: Testing Accuracy");
((DecisionTreeGenerator)generator).SetHint(0);
var learned = Learner.Learn(tennis, 0.80, 100, generator);
var m = learned.Model;
double accuracy = learned.Accuracy;
Console.WriteLine($"Learned {m.GetType().Name} model with {accuracy*100}% accuracy");
Console.WriteLine(m);
Tennis h = new Tennis
{
Outlook = Outlook.Sunny,
Temperature = Temperature.Hot,
Windy = false
};
Tennis o = m.Predict(h);
Console.WriteLine($"Play: {o.Play}");
}
public static Tennis[] GetData()
{
return(new Tennis[]
{
Tennis.Make(Outlook.Sunny, Temperature.Hot, Humidity.High, false, false),
Tennis.Make(Outlook.Sunny, Temperature.Hot, Humidity.High, true, false),
Tennis.Make(Outlook.Overcast, Temperature.Hot, Humidity.High, false, true),
Tennis.Make(Outlook.Rainy, Temperature.Mild, Humidity.High, false, true),
Tennis.Make(Outlook.Rainy, Temperature.Cool, Humidity.Normal, false, true),
Tennis.Make(Outlook.Rainy, Temperature.Cool, Humidity.Normal, true, false),
Tennis.Make(Outlook.Overcast, Temperature.Cool, Humidity.Normal, true, true),
Tennis.Make(Outlook.Sunny, Temperature.Mild, Humidity.High, false, false),
Tennis.Make(Outlook.Sunny, Temperature.Cool, Humidity.Normal, false, true),
Tennis.Make(Outlook.Rainy, Temperature.Mild, Humidity.Normal, false, true),
Tennis.Make(Outlook.Sunny, Temperature.Mild, Humidity.Normal, true, true),
Tennis.Make(Outlook.Overcast, Temperature.Mild, Humidity.High, true, true),
Tennis.Make(Outlook.Overcast, Temperature.Hot, Humidity.Normal, false, true),
Tennis.Make(Outlook.Rainy, Temperature.Mild, Humidity.High, true, false)
});
}