public void Calculate_ShouldReturnXPosWhereFunctionResultIsMinimum()
{
var functionHandler = new TwoVarsFunc("2 * x1 ^ 2 + x1 * x2 + x2 ^ 2");
var constantStepGradientDescent = new ConstantStepGradientDescent(0.5, 1, 0.5, 0.1, 0.15, 10, 0.5, functionHandler);
var pair = constantStepGradientDescent.Calculate();
var result = Math.Round(functionHandler.Calculate(pair.x1, pair.x2) * 10000) / 10000;
Assert.AreEqual(0.0075, result);
}
public void Calculate_ShouldReturnXPosesWhereFunctionResultIsMinimum()
{
var functionHandler = new TwoVarsFunc("2 * x1 ^ 2 + x1 * x2 + x2 ^ 2");
var constantSlope = new SteppestGradientDescent(0.5, 1, 0.1, 0.15, 10, functionHandler);
var pair = constantSlope.Calculate();
var predict = new Pair {
x1 = -0.0176, x2 = 0.032
};
var result = UnderError(pair.x1, predict.x1, 7) && UnderError(pair.x2, predict.x2, 7);
Assert.AreEqual(true, result);
}
public ConstantStepGradientDescent(double x1, double x2, double e, double e1, double e2, int M, double tk, TwoVarsFunc twoVarsFunc)
{
this.xPairs = new List <Pair>();
this.deltaFResults = new List <Pair>();
this.functionHandler = twoVarsFunc;
this.xPairs.Add(new Pair()
{
x1 = x1, x2 = x2
});
this.e = e;
this.e1 = e1;
this.e2 = e2;
this.M = M;
this.tk = tk;
}
public SteppestGradientDescent(double x1, double x2, double e1, double e2, int M, TwoVarsFunc func)
{
this.functionHandler = func;
this.xPairs.Add(new Pair {
x1 = x1, x2 = x2
});
this.e1 = e1;
this.e2 = e2;
this.M = M;
}
