Why the results of my Elman network are different every time?
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Heather Zhang
el 31 de Jul. de 2015
Comentada: Greg Heath
el 13 de Ag. de 2015
I created a elman network. But the results every time I run the code were different.I got different "errors","regression" and "avg_error" Could anyone tell me why? Appreciate SO MUCH!
Here is the code.
clear all
load('input4_train.mat');
load('output4_train.mat');
load('input4_test.mat');
load('output4_test.mat');
inputSeries = tonndata(input4_train,false,false);
targetSeries = tonndata(output4_train,false,false);
inputTest = tonndata(input4_test,false,false);
outputTest = tonndata(output4_test,false,false);
% Create a Network
hiddenLayerSize = 5;
net=newelm(inputSeries,targetSeries,[10,3,1], {'tansig','logsig','purelin'});
% Setup Division of Data for Training, Validation, Testing
net.divideParam.trainRatio = 70/100;
net.divideParam.valRatio = 15/100;
net.divideParam.testRatio = 15/100;
net.trainParam.epochs = 2000;
% Initial net
net = init(net);
% Train the Network
net = adapt(net,inputSeries,targetSeries);
% Test the Network
outputs = sim(net,inputTest);
errors = gsubtract(outputTest,outputs);
error = cell2mat(errors);
for i = 1:10
error(i)=abs(error(i));
end
avg_error = sum(error)/10;
performance = perform(net,outputTest,outputs)
% View the Network
view(net)
% Plots
figure, plotregression(outputTest,outputs)
figure, plotresponse(outputTest,outputs)
figure, ploterrcorr(errors)
3 comentarios
Greg Heath
el 1 de Ag. de 2015
Editada: Walter Roberson
el 2 de Ag. de 2015
% load('input4_train.mat');
% load('output4_train.mat');
% load('input4_test.mat');
% load('output4_test.mat');
%
% inputSeries = tonndata(input4_train,false,false);
% targetSeries = tonndata(output4_train,false,false);
% inputTest = tonndata(input4_test,false,false);
% outputTest = tonndata(output4_test,false,false);
whos
% % Create a Network
% hiddenLayerSize = 5;
Value never used
% net=newelm(inputSeries,targetSeries,[10,3,1], {'tansig','logsig','purelin'});
No justification for 3 hidden layers. One is sufficient.
% % Setup Division of Data for Training, Validation, Testing
% net.divideParam.trainRatio = 70/100;
% net.divideParam.valRatio = 15/100;
% net.divideParam.testRatio = 15/100;
Above 3 commands unnecessary for default values.
% net.trainParam.epochs = 2000;
%
% % Initial net
% net = init(net);
%
% % Train the Network
% net = adapt(net,inputSeries,targetSeries);
%
% % Test the Network
% outputs = sim(net,inputTest);
%
% errors = gsubtract(outputTest,outputs);
% error = cell2mat(errors);
% for i = 1:10
% error(i)=abs(error(i));
% end
% avg_error = sum(error)/10;
Above 5 commands unnecessary.
help mae
doc mae
% performance = perform(net,outputTest,outputs)
% % View the Network
% view(net)
%
% % Plots
% figure, plotregression(outputTest,outputs)
% figure, plotresponse(outputTest,outputs)
% figure, ploterrcorr(errors)
Defaults: Above 3 commands unnecessary;
Respuesta aceptada
Walter Roberson
el 31 de Jul. de 2015
Neural Networks initialize their weights randomly usually. If you want repeatability you can initialize the weights yourself or you can set the random number generator seed.
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