Hopfield Asociativa

import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
public class Hopfield extends JFrame implements ActionListener {
public static final int NETWORK_SIZE = 8;
JTextField matrix[][] =
new JTextField[NETWORK_SIZE][NETWORK_SIZE];
JComboBox input[] = new JComboBox[NETWORK_SIZE];
JTextField output[] = new JTextField[NETWORK_SIZE];
JButton btnClear = new JButton("Clear");
JButton btnTrain = new JButton("Train");
JButton btnRun = new JButton("Run");
public Hopfield()
{
setTitle("Hopfield Neural Network");
JPanel connections = new JPanel();
connections.setLayout(
new GridLayout(NETWORK_SIZE,NETWORK_SIZE) );
for ( int row=0;row
for ( int col=0;col
matrix[row][col] = new JTextField(3);
matrix[row][col].setText("0");
connections.add(matrix[row][col]);
}
}
Container content = getContentPane();
GridBagLayout gridbag = new GridBagLayout();
GridBagConstraints c = new GridBagConstraints();
content.setLayout(gridbag);
c.fill = GridBagConstraints.NONE;
c.weightx = 1.0;
c.gridwidth = GridBagConstraints.REMAINDER; //end row
c.anchor = GridBagConstraints.NORTHWEST;
content.add(
new JLabel(
"Weight Matrix for the Hopfield Neural Network:"),c);
c.anchor = GridBagConstraints.CENTER;
c.gridwidth = GridBagConstraints.REMAINDER; //end row
content.add(connections,c);
c.gridwidth = 1;
c.anchor = GridBagConstraints.NORTHWEST;
c.gridwidth = GridBagConstraints.REMAINDER; //end row
content.add(
new JLabel(
"Click \"Train\" to train the following pattern:"),c);
String options[] = { "0","1"};
JPanel inputPanel = new JPanel();
inputPanel.setLayout(new FlowLayout());
for ( int i=0;i
input[i] = new JComboBox(options);
inputPanel.add(input[i]);
}
c.gridwidth = GridBagConstraints.REMAINDER; //end row
c.anchor = GridBagConstraints.CENTER;
content.add(inputPanel,c);
c.anchor = GridBagConstraints.NORTHWEST;
c.gridwidth = GridBagConstraints.REMAINDER; //end row
content.add(
new JLabel("Click \"Run\" to see output pattern:"),c);
JPanel outputPanel = new JPanel();
outputPanel.setLayout(new FlowLayout());
for ( int i=0;i
output[i] = new JTextField(3);
output[i].setEditable(false);
outputPanel.add(output[i]);
}
c.gridwidth = GridBagConstraints.REMAINDER; //end row
c.anchor = GridBagConstraints.CENTER;
content.add(outputPanel,c);
JPanel buttonPanel = new JPanel();
btnClear = new JButton("Clear");
btnTrain = new JButton("Train");
btnRun = new JButton("Run");
btnClear.addActionListener(this);
btnTrain.addActionListener(this);
btnRun.addActionListener(this);
buttonPanel.setLayout(new FlowLayout());
buttonPanel.add(btnClear);
buttonPanel.add(btnTrain);
buttonPanel.add(btnRun);
content.add(buttonPanel,c);
pack();
Toolkit toolkit = Toolkit.getDefaultToolkit();
Dimension d = toolkit.getScreenSize();
setLocation(
(int)(d.width-this.getSize().getWidth())/2,
(int)(d.height-this.getSize().getHeight())/2 );
setDefaultCloseOperation(WindowConstants.DISPOSE_ON_CLOSE);
setResizable(false);
}
public void actionPerformed(ActionEvent e)
{
if ( e.getSource()==btnRun )
run();
else if ( e.getSource()==btnClear )
clear();
else if ( e.getSource()==btnTrain )
train();
}
protected void run()
{
boolean pattern[] = new boolean[NETWORK_SIZE];
int wt[][] = new int[NETWORK_SIZE][NETWORK_SIZE];
for ( int row=0;row
for ( int col=0;col
wt[row][col]=Integer.parseInt(matrix[row][col].getText());
for ( int row=0;row
int i = input[row].getSelectedIndex();
if ( i==0 )
pattern[row] = false;
else
pattern[row] = true;
}
Layer net = new Layer(wt);
net.activation(pattern);
for ( int row=0;row
if ( net.output[row] )
output[row].setText("1");
else
output[row].setText("0");
if ( net.output[row]==pattern[row] )
output[row].setBackground(java.awt.Color.green);
else
output[row].setBackground(java.awt.Color.red);
}
}
protected void clear()
{
for ( int row=0;row
for ( int col=0;col
matrix[row][col].setText("0");
}
protected void train()
{
int work[][] = new int[NETWORK_SIZE][NETWORK_SIZE];
int bi[] = new int[NETWORK_SIZE];

for ( int x=0;x
if ( input[x].getSelectedIndex()==0 )
bi[x] = -1;
else
bi[x] = 1;
}
for ( int row=0;row
for ( int col=0;col
work[row][col] = bi[row]*bi[col];
}
for ( int x=0;x
work[x][x] =-1;
for ( int row=0;row
for ( int col=0;col
int i = Integer.parseInt(matrix[row][col].getText());
matrix[row][col].setText( "" + (i+work[row][col]));
}
}
static public void main(String args[])
{
JFrame f = new Hopfield();
f.show();
}
}
public class Layer {
protected Neuron neuron[] = new Neuron[8];
protected boolean output[] = new boolean[8];
protected int neurons;
public static final double lambda = 1.0;
Layer(int weights[][])
{
neurons = weights[0].length;
neuron = new Neuron[neurons];
output = new boolean[neurons];
for ( int i=0;i
neuron[i]=new Neuron(weights[i]);
}

public boolean threshold(int k)
{
double kk = k * lambda;
double a = Math.exp( kk );
double b = Math.exp( -kk );
double tanh = (a-b)/(a+b);
return(tanh>=0);
}
void activation(boolean pattern[])
{
int i,j;
for ( i=0;i<8;i++ ) {
neuron[i].activation = neuron[i].act(pattern);
output[i] = threshold(neuron[i].activation);
}
}
}
public class Neuron {
public int weightv[];
public int activation;
public Neuron(int in[])
{
weightv = in;
}
public int act(boolean x[] )
{
int i;
int a=0;
for ( i=0;i
if ( x[i] )
a+=weightv[i];
return a;
}
}