Why is solution not exact when "fixed"

[Lawrence]

Solution and data - not the same

FixedData.PNG (137.23 KiB) Viewed 11492 times

Hi,

I am using

ActivationNetwork network = new ActivationNetwork(
new BipolarSigmoidFunction(sigmoidAlphaValue),
inputList.Count,
inputList.Count,
1);

BackPropagationLearning teacher = new BackPropagationLearning(network);

With the same data for input AND output - just to see process of weights being set.

So inputList.Count == 1;

Why does the solution line, not match the data line exactly. They are the same data...

[andrew.kirillov]

Hello,

Network's weights are set randomly initially. Then you teach it to get result you need. Obviously it may take certain number of iterations for weights to converge to "optimal". Play with number of iterations, learning parameters ...

[Lawrence]

Fixed2.PNG (124.22 KiB) Viewed 11489 times

Hi Andrew,

I have actually tried all manner of variants of the parameters but I still never get to an exact match - is that because of the Sigmoid?

I can't get better match than the picture above.