MATLAB Answers


taraining error when neural network training is done .each time training isd one the results are different

Asked by mayuresh
on 3 Dec 2012

i am doing neural network ,training the netwrk eah time gives different results.


1 Answer

Answer by Greg Heath
on 3 Dec 2012
 Accepted answer

Training performance varies because the default train/val/test data division AND initial weights are pseudorandom.

One of many solutions for sufficiently large data sets.

1. Initialize the RNG so that the same stream of pseudorandom numbers can be repeated.


2. Design 10 or more nets

3. Choose the net with the smallest validation (NOT TRAINING) set error.

4. Estimate the performance on unseen data with the test set error.

5. If performance is unsatisfactory, try increasing the number of hidden nodes.

How large are X and T?

Hope this helps.

Thank you for formally accepting my answer



i can't understand that is there any code for doing that random number generations?????

Greg Heath
on 7 Dec 2012

The pseudo random number generation is done automatically. However if you want to duplicate your run(s). You must intialize the geneator.

help rng

doc rng


can u suggest some book/papers on designing of number of layers and neurons in the layers.

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