Edit: How do I calculate the output for a non traning input?

Submitted by allissaid on Tue, 07/20/2010 - 04:49

Using Encog in Java

Hallo and thanks for the amazing Encog project.

In the XOR (backprop type of NN) example I can see how you calculate the outputs for the training inputs,
but how can I compute the output for an specific input? Not the training inputs,
an input that I declare once the network is trained.

Thanks very much for the patience.

allissaid

Submitted by allissaid on Thu, 07/22/2010 - 14:58.

Ok I have realized that I have to create a NeuralData type of variable and use network.compute().

But here is where I am:

final NeuralData input;
input.setData(C);

where C is a double array with the pattern I want to recognize.

The compiler says:

The local variable input may not have been initialized.

Any help? Should be easy!

Thanks again.

Submitted by gshank on Fri, 07/23/2010 - 04:25.

I make it a habit to initialize all variables so either:
NeuralData input = null; // and then set it later
-- OR --
double[] data = { something };
DataNormalization normalize = new DataNormalization();
NeuralData input = normalize.buildForNetworkInput(data);

Submitted by allissaid on Fri, 07/23/2010 - 10:50.

The first option still doesnt work,

but so does the second one!

Thanks gshank.

By the way, do you know how to save a network in order to do not train it every time I want to execute the aplication?

Thanks again.

Submitted by gshank on Mon, 07/26/2010 - 06:20.

private void save(String filename) throws FileNotFoundException, IOException {
ObjectOutputStream out = null;
try {
out = new ObjectOutputStream(new FileOutputStream(filename));
out.writeObject(network); // network is BasicNetwork class variable
}
finally {
out.close();
}
}
private void load(String filename) throws FileNotFoundException, IOException, ClassNotFoundException {
ObjectInputStream in = null;
try {
in = new ObjectInputStream(new FileInputStream(filename));
network = (BasicNetwork)in.readObject(); // network is a BasicNetwork class variable
}
finally {
in.close();
}
}

Submitted by allissaid on Tue, 07/27/2010 - 09:28.

Thank you very much for the patience gshank.

I am now trying to call the save method, and I get this from the compiler:

"Exception in thread "main" java.lang.Error: Unresolved compilation problem:
The method save(String) from the type XaxraNeuronal refers to the missing type FileNotFoundException"

Can you help me?

Thanks again !

Submitted by gshank on Tue, 07/27/2010 - 14:43.

you need to have import's for each of those classes. For example, you'll need:
import java.io.FileNotFoundException;
or in your case, you might want to just do:
import java.io.*;
which imports all java.io classes