com.imsl.test.example.datamining.neural

Class EpochTrainerEx1

java.lang.Object

com.imsl.test.example.datamining.neural.EpochTrainerEx1

All Implemented Interfaces:

Serializable

public class EpochTrainerEx1
extends Object
implements Serializable

Trains a 2-layer network using the 2-stage Epoch trainer.

This example trains a 2-layer network using 100 training patterns from one nominal and one continuous input attribute. The nominal attribute has three classes which are encoded using binary encoding. This results in three binary network input columns. The continuous input attribute is scaled to fall in the interval [0,1].

The network training targets were generated using the relationship: $$y = 10X_1 + 20X_2 + 30X_3 + 2.0X_4$$ where

\(X_1, X_2, X_3\) are the three binary columns, corresponding to categories 1-3 of the nominal attribute, and \(X_4\) is the scaled continuous attribute.

The structure of the network consists of four input nodes and two layers, with three perceptrons in the hidden layer and one in the output layer. The following figure illustrates this structure:

With 4 inputs, 3 perceptrons in the hidden layer, and one output perceptron, there are a total of 19 weights in this network (4x3+3x1+3+1). The activation functions are all linear. Since the target output is a linear function of the input attributes, linear activation functions guarantee that the network fitted values will exactly match their targets. Of course, this same result could have been obtained using linear multiple regression.

Training is conducted using a two-stage Epoch trainer. The trainer for Stage I is set to the Least Squares Trainer. The number of epochs is set to 10 and the epoch size (number of randomly selected observations for each epoch) is set to 20. Stage II training is conducted using the quasi-Newton trainer. Stage II training is always conducted using all training patterns. Stage II training is optional.

See Also:

Code, Output, Serialized Form

Constructor Summary

Constructors

Constructor and Description
EpochTrainerEx1()

Method Summary

Modifier and Type	Method and Description
static void	main(String[] args)
static void	write(Object obj, String filename)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

EpochTrainerEx1

public EpochTrainerEx1()

Method Detail

main

public static void main(String[] args)
                 throws Exception

Throws:

Exception

write

public static void write(Object obj,
                         String filename)
                  throws IOException

Throws:

IOException