Example #1
0
File: ANN.go Project: eddytrex/AIgo
//TODO the activation function and his Derviate has to be more general.. to implemente soft-max for example
func (this *ANN) ForwardPropagation(In *Matrix.Matrix) (As, AsDerviate *([]*Matrix.Matrix), Output *Matrix.Matrix) {
	if In.GetMRows() == this.Inputs && In.GetNColumns() == 1 {
		As1 := make([]*Matrix.Matrix, len(this.Weights)+1, len(this.Weights)+1)
		AsDerviate1 := make([]*Matrix.Matrix, len(this.Weights)+1, len(this.Weights)+1)

		As := &As1
		AsDerviate = &AsDerviate1

		sTemp := In.Transpose()

		//Add  a new column for a Bias Weight
		sTemp = sTemp.AddColumn(Matrix.I(1))

		holeInput := sTemp.Copy()
		As1[0] = sTemp.Transpose()

		//Derivate
		//sutract, _ := Matrix.Sustract(Matrix.OnesMatrix(As1[0].GetMRows(), 1), As1[0])
		//derivate := Matrix.DotMultiplication(As1[0], sutract)

		//derivate := holeInput.Apply(this.Derivate)
		derivate := this.DarivateActivationLayer(holeInput)

		AsDerviate1[0] = derivate.Transpose()

		for i := 0; i < len(this.Weights); i++ {
			sTemp = Matrix.Product(sTemp, (this.Weights[i]))

			//apply the activation functions
			holeInput := sTemp.Copy()
			sTemp = this.ActivationLayer(sTemp)

			//sTemp = sTemp.Apply(this.Activation)

			//Add  a new column for a Bias Weight
			sTemp = sTemp.AddColumn(Matrix.I(1))
			(*As)[i+1] = sTemp.Transpose()

			//Derivate
			//sutract, _ := Matrix.Sustract(Matrix.OnesMatrix((*As)[i+1].GetMRows(), 1), (*As)[i+1])
			//derivate := Matrix.DotMultiplication((*As)[i+1], sutract)

			derivate := this.DarivateActivationLayer(holeInput)
			//derivate := holeInput.Apply(this.Derivate)

			(*AsDerviate)[i+1] = derivate.Transpose()

		}
		Asf := sTemp.Copy()

		//Asf = Asf.AddColumn(Matrix.I(1))
		(*As)[len(As1)-1] = Asf.Transpose()
		Output = sTemp.Transpose().MatrixWithoutLastRow()
		return As, AsDerviate, Output
	}
	return nil, nil, nil
}
Example #2
0
File: ANN.go Project: eddytrex/AIgo
func (this *ANN) BackPropagation(As, AsDerviate *[](*Matrix.Matrix), ForwardOutput *Matrix.Matrix, Y *Matrix.Matrix, flen float64) {
	ð := this.DerviateCostFunction(ForwardOutput, Y)

	this.ð[len(this.ð)-1] = ð

	this.AcumatedError, _ = Matrix.Sum(this.CostFunction(ForwardOutput, Y), this.AcumatedError)

	for i := len(this.Weights) - 1; i >= 0; i-- {
		A := (*As)[i]
		Aderviate := (*AsDerviate)[i]

		var ðtemp *Matrix.Matrix
		if i == len(this.Weights)-1 {
			ðtemp = this.ð[i+1].Transpose()
		} else {
			ðtemp = this.ð[i+1].MatrixWithoutLastRow().Transpose()
		}

		//Calc ð

		//fmt.Println("ð(i+1)", this.ð[i+1].ToString())
		//fmt.Println("W(i)", this.Weights[i].ToString())

		Product := Matrix.Product(this.Weights[i], ðtemp.Transpose())
		//fmt.Println("Product", i, " ", Product.ToString())

		this.ð[i] = Matrix.DotMultiplication(Product, Aderviate.AddRowsToDown(Matrix.I(1)))

		//Calc of Derivate with respect to the Weights

		//ðtemp:= i==len(this.Weights) - 1? this.ð[i+1].Transpose() : this.ð[i+1].MatrixWithoutLastRow().Transpose()
		Dw := Matrix.Product(A, ðtemp)

		this.Δ[i], _ = Matrix.Sum(this.Δ[i], Dw)
	}

	return
}