Error definition in Encoq

Submitted by Diamantregen on Fri, 05/21/2010 - 08:43

Encog General Discussion

Hi,

A quick question, how is the ITrain.Error defined? Somehow it doesn't seem to be the MSE (mean square error). Thanks.

Regards,
Roger

Submitted by jeffheaton on Fri, 05/21/2010 - 10:33.

Basically, I take the square of every error difference. Then at the end I take the square root of that divided by the number of cases.

Submitted by Diamantregen on Sun, 05/23/2010 - 22:41.

Hi Jeff,

Thanks for the info. Uhm, is there any chance to add a method for MSE error (http://www.informatik.htw-dresden.de/~iwe/Belege/2004/Matzke/Dokumentati... and http://www.informatik.htw-dresden.de/~iwe/Belege/2004/Matzke/Dokumentati...)? I could imagine that it could be done without much costs, especially as it's very similar to the root mean square. Last but not least, MSE is the most commonly used error calculation method for ANNs. Thanks.

Regards,
Roger

Submitted by Diamantregen on Tue, 05/25/2010 - 20:58.

Hi,

I have digged a little into the Encog code and really think it's feasible to add MSE support. However in the meantime I will just use a quick&dirty approach which is modifying the ErrorCalculation class this way and rebuilding Encog:

[...]
public double CalculateRMS()
{
double err = this.globalError / this.setSize;
return err;
}
[...]

Regards,
Roger

Submitted by Diamantregen on Mon, 08/23/2010 - 08:07.