Artificial Neural Network in Matlab Hany Ferdinando.

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Presentation transcript:

Artificial Neural Network in Matlab Hany Ferdinando

Neural Network in Matlab2 Architecture (single neuron) w is weight matrices, dimension 1xR p is input vector, dimension Rx1 b is bias a = f(Wp + b)

Neural Network in Matlab3 Transfer Function

Neural Network in Matlab4 Architecture with neurons w is weight matrices, dimension SxR p is input vector, dimension Rxn b is bias

Neural Network in Matlab5 Multiple layers

Neural Network in Matlab6 Perceptrons in Matlab Make the perceptrons with net = newp(PR,S,TF,LF) PR = Rx2 matrix of min and max values for R input elements S = number of output vector TF = Transfer function, default = hardlim, other option = hardlims LF = Learning function, default = learnp, other option = learnpn learnp w = (t-a)p T = ep T learnpn normalized learnp hardlim = hardlimit function hardlims = symetric hardlimit function W new = W old + Wb new = b old + ewhere e = t - a

Neural Network in Matlab7 Compute manually… This is an exercise how to run the artificial neural network From the next problem, we will compute the weights and biases manually

Neural Network in Matlab8 AND Gate in Perceptron P = [ ; ]; T = [ ]; net = newp([0 1; 0 1],1); weight_init = net.IW{1,1} bias_init = net.b{1} net.trainParam.epochs = 20; net = train(net,P,T); weight_final = net.IW{1,1} bias_final = net.b{1} simulation = sim(net,P) weight_init = [0 0], bias_init = 0 weight_final = [2 1], bias_final = -3

Neural Network in Matlab9 OR Gate in Perceptron P = [ ; ]; T = [ ]; net = newp([0 1; 0 1],1); weight_init = net.IW{1,1} bias_init = net.b{1} net.trainParam.epochs = 20; net = train(net,P,T); weight_final = net.IW{1,1} bias_final = net.b{1} simulation = sim(net,P) weight_init = [0 0], bias_init = 0 weight_final = [1 1], bias_final = -1

Neural Network in Matlab10 NAND Gate in Perceptron P = [ ; ]; T = [ ]; net = newp([0 1; 0 1],1); weight_init = net.IW{1,1} bias_init = net.b{1} net.trainParam.epochs = 20; net = train(net,P,T); weight_final = net.IW{1,1} bias_final = net.b{1} simulation = sim(net,P) weight_init = [0 0], bias_init = 0 weight_final = [-2 -1], bias_final = 2

Neural Network in Matlab11 NOR Gate in Perceptron P = [ ; ]; T = [ ]; net = newp([0 1; 0 1],1); weight_init = net.IW{1,1} bias_init = net.b{1} net.trainParam.epochs = 20; net = train(net,P,T); weight_final = net.IW{1,1} bias_final = net.b{1} simulation = sim(net,P) weight_init = [0 0], bias_init = 0 weight_final = [-1 -1], bias_final = 0

Neural Network in Matlab12 Backpropagation in Matlab Make the backpropagation with net = newff(PR,[S1 S2...SNl],{TF1 TF2...TFNl},BTF,BLF,PF) PR = Rx2 matrix of min and max values for R input elements S = number of output vector BTF = Transfer function (user can use any transfer functions) BLF = Learning function PF = performance x k+1 = x k - k g k

Neural Network in Matlab13 Linear Filter (with ANN) in Matlab Make the Linear Filter with newlin(PR,S,ID,LR) PR = Rx2 matrix of min and max values for R input elements S = number of output vector ID = delay LR = Learning Rate Transfer function for linear filter is only linear line (purelin)