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Math Forum » Discussions » Software » comp.soft-sys.matlab

Topic: Function predict is very slow when applying NN model!?
Replies: 3   Last Post: Oct 17, 2012 3:36 AM

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grega

Posts: 42
Registered: 10/29/07
Function predict is very slow when applying NN model!?
Posted: Oct 12, 2012 8:58 AM
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Hey

Has anyone experienced the same problem with predict function (system identification toolbox) when applying NN model (neural network toolbox); namely the predict.m is very slow?

I applied two models on predict function and measured the time:
1. m1 = ARX(TR,[6 6 1]); % abbreviated notation, it's actually MIMO system 2x14
tic,predict(m1,TE,1:30),toc takes <4s

2. NL = neuralnet(feedforwardnet( 3 ));
m2 = nlarx(TR,[4 4 1],NL); % abbreviated notation, it's actually MIMO system 2x14
tic,predict(m2,TE,1:30),toc takes 20 min!!

How can this be? Please any suggestion to work around the problem?

Tnx

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