实例介绍
【实例简介】含 java python相关 源码
【实例截图】
【实例截图】
【核心代码】
import libsvm.*;
import java.applet.*;
import java.awt.*;
import java.util.*;
import java.awt.event.*;
import java.io.*;
public class svm_toy extends Applet {
static final String DEFAULT_PARAM="-t 2 -c 100";
int XLEN;
int YLEN;
// off-screen buffer
Image buffer;
Graphics buffer_gc;
// pre-allocated colors
final static Color colors[] =
{
new Color(0,0,0),
new Color(0,120,120),
new Color(120,120,0),
new Color(120,0,120),
new Color(0,200,200),
new Color(200,200,0),
new Color(200,0,200)
};
class point {
point(double x, double y, byte value)
{
this.x = x;
this.y = y;
this.value = value;
}
double x, y;
byte value;
}
Vector<point> point_list = new Vector<point>();
byte current_value = 1;
public void init()
{
setSize(getSize());
final Button button_change = new Button("Change");
Button button_run = new Button("Run");
Button button_clear = new Button("Clear");
Button button_save = new Button("Save");
Button button_load = new Button("Load");
final TextField input_line = new TextField(DEFAULT_PARAM);
BorderLayout layout = new BorderLayout();
this.setLayout(layout);
Panel p = new Panel();
GridBagLayout gridbag = new GridBagLayout();
p.setLayout(gridbag);
GridBagConstraints c = new GridBagConstraints();
c.fill = GridBagConstraints.HORIZONTAL;
c.weightx = 1;
c.gridwidth = 1;
gridbag.setConstraints(button_change,c);
gridbag.setConstraints(button_run,c);
gridbag.setConstraints(button_clear,c);
gridbag.setConstraints(button_save,c);
gridbag.setConstraints(button_load,c);
c.weightx = 5;
c.gridwidth = 5;
gridbag.setConstraints(input_line,c);
button_change.setBackground(colors[current_value]);
p.add(button_change);
p.add(button_run);
p.add(button_clear);
p.add(button_save);
p.add(button_load);
p.add(input_line);
this.add(p,BorderLayout.SOUTH);
button_change.addActionListener(new ActionListener()
{ public void actionPerformed (ActionEvent e)
{ button_change_clicked(); button_change.setBackground(colors[current_value]); }});
button_run.addActionListener(new ActionListener()
{ public void actionPerformed (ActionEvent e)
{ button_run_clicked(input_line.getText()); }});
button_clear.addActionListener(new ActionListener()
{ public void actionPerformed (ActionEvent e)
{ button_clear_clicked(); }});
button_save.addActionListener(new ActionListener()
{ public void actionPerformed (ActionEvent e)
{ button_save_clicked(); }});
button_load.addActionListener(new ActionListener()
{ public void actionPerformed (ActionEvent e)
{ button_load_clicked(); }});
input_line.addActionListener(new ActionListener()
{ public void actionPerformed (ActionEvent e)
{ button_run_clicked(input_line.getText()); }});
this.enableEvents(AWTEvent.MOUSE_EVENT_MASK);
}
void draw_point(point p)
{
Color c = colors[p.value 3];
Graphics window_gc = getGraphics();
buffer_gc.setColor(c);
buffer_gc.fillRect((int)(p.x*XLEN),(int)(p.y*YLEN),4,4);
window_gc.setColor(c);
window_gc.fillRect((int)(p.x*XLEN),(int)(p.y*YLEN),4,4);
}
void clear_all()
{
point_list.removeAllElements();
if(buffer != null)
{
buffer_gc.setColor(colors[0]);
buffer_gc.fillRect(0,0,XLEN,YLEN);
}
repaint();
}
void draw_all_points()
{
int n = point_list.size();
for(int i=0;i<n;i )
draw_point(point_list.elementAt(i));
}
void button_change_clicked()
{
current_value;
if(current_value > 3) current_value = 1;
}
private static double atof(String s)
{
return Double.valueOf(s).doubleValue();
}
private static int atoi(String s)
{
return Integer.parseInt(s);
}
void button_run_clicked(String args)
{
// guard
if(point_list.isEmpty()) return;
svm_parameter param = new svm_parameter();
// default values
param.svm_type = svm_parameter.C_SVC;
param.kernel_type = svm_parameter.RBF;
param.degree = 3;
param.gamma = 0;
param.coef0 = 0;
param.nu = 0.5;
param.cache_size = 40;
param.C = 1;
param.eps = 1e-3;
param.p = 0.1;
param.shrinking = 1;
param.probability = 0;
param.nr_weight = 0;
param.weight_label = new int[0];
param.weight = new double[0];
// parse options
StringTokenizer st = new StringTokenizer(args);
String[] argv = new String[st.countTokens()];
for(int i=0;i<argv.length;i )
argv[i] = st.nextToken();
for(int i=0;i<argv.length;i )
{
if(argv[i].charAt(0) != '-') break;
if( i>=argv.length)
{
System.err.print("unknown option\n");
break;
}
switch(argv[i-1].charAt(1))
{
case 's':
param.svm_type = atoi(argv[i]);
break;
case 't':
param.kernel_type = atoi(argv[i]);
break;
case 'd':
param.degree = atoi(argv[i]);
break;
case 'g':
param.gamma = atof(argv[i]);
break;
case 'r':
param.coef0 = atof(argv[i]);
break;
case 'n':
param.nu = atof(argv[i]);
break;
case 'm':
param.cache_size = atof(argv[i]);
break;
case 'c':
param.C = atof(argv[i]);
break;
case 'e':
param.eps = atof(argv[i]);
break;
case 'p':
param.p = atof(argv[i]);
break;
case 'h':
param.shrinking = atoi(argv[i]);
break;
case 'b':
param.probability = atoi(argv[i]);
break;
case 'w':
param.nr_weight;
{
int[] old = param.weight_label;
param.weight_label = new int[param.nr_weight];
System.arraycopy(old,0,param.weight_label,0,param.nr_weight-1);
}
{
double[] old = param.weight;
param.weight = new double[param.nr_weight];
System.arraycopy(old,0,param.weight,0,param.nr_weight-1);
}
param.weight_label[param.nr_weight-1] = atoi(argv[i-1].substring(2));
param.weight[param.nr_weight-1] = atof(argv[i]);
break;
default:
System.err.print("unknown option\n");
}
}
// build problem
svm_problem prob = new svm_problem();
prob.l = point_list.size();
prob.y = new double[prob.l];
if(param.kernel_type == svm_parameter.PRECOMPUTED)
{
}
else if(param.svm_type == svm_parameter.EPSILON_SVR ||
param.svm_type == svm_parameter.NU_SVR)
{
if(param.gamma == 0) param.gamma = 1;
prob.x = new svm_node[prob.l][1];
for(int i=0;i<prob.l;i )
{
point p = point_list.elementAt(i);
prob.x[i][0] = new svm_node();
prob.x[i][0].index = 1;
prob.x[i][0].value = p.x;
prob.y[i] = p.y;
}
// build model & classify
svm_model model = svm.svm_train(prob, param);
svm_node[] x = new svm_node[1];
x[0] = new svm_node();
x[0].index = 1;
int[] j = new int[XLEN];
Graphics window_gc = getGraphics();
for (int i = 0; i < XLEN; i )
{
x[0].value = (double) i / XLEN;
j[i] = (int)(YLEN*svm.svm_predict(model, x));
}
buffer_gc.setColor(colors[0]);
buffer_gc.drawLine(0,0,0,YLEN-1);
window_gc.setColor(colors[0]);
window_gc.drawLine(0,0,0,YLEN-1);
int p = (int)(param.p * YLEN);
for(int i=1;i<XLEN;i )
{
buffer_gc.setColor(colors[0]);
buffer_gc.drawLine(i,0,i,YLEN-1);
window_gc.setColor(colors[0]);
window_gc.drawLine(i,0,i,YLEN-1);
buffer_gc.setColor(colors[5]);
window_gc.setColor(colors[5]);
buffer_gc.drawLine(i-1,j[i-1],i,j[i]);
window_gc.drawLine(i-1,j[i-1],i,j[i]);
if(param.svm_type == svm_parameter.EPSILON_SVR)
{
buffer_gc.setColor(colors[2]);
window_gc.setColor(colors[2]);
buffer_gc.drawLine(i-1,j[i-1] p,i,j[i] p);
window_gc.drawLine(i-1,j[i-1] p,i,j[i] p);
buffer_gc.setColor(colors[2]);
window_gc.setColor(colors[2]);
buffer_gc.drawLine(i-1,j[i-1]-p,i,j[i]-p);
window_gc.drawLine(i-1,j[i-1]-p,i,j[i]-p);
}
}
}
else
{
if(param.gamma == 0) param.gamma = 0.5;
prob.x = new svm_node [prob.l][2];
for(int i=0;i<prob.l;i )
{
point p = point_list.elementAt(i);
prob.x[i][0] = new svm_node();
prob.x[i][0].index = 1;
prob.x[i][0].value = p.x;
prob.x[i][1] = new svm_node();
prob.x[i][1].index = 2;
prob.x[i][1].value = p.y;
prob.y[i] = p.value;
}
// build model & classify
svm_model model = svm.svm_train(prob, param);
svm_node[] x = new svm_node[2];
x[0] = new svm_node();
x[1] = new svm_node();
x[0].index = 1;
x[1].index = 2;
Graphics window_gc = getGraphics();
for (int i = 0; i < XLEN; i )
for (int j = 0; j < YLEN ; j ) {
x[0].value = (double) i / XLEN;
x[1].value = (double) j / YLEN;
double d = svm.svm_predict(model, x);
if (param.svm_type == svm_parameter.ONE_CLASS && d<0) d=2;
buffer_gc.setColor(colors[(int)d]);
window_gc.setColor(colors[(int)d]);
buffer_gc.drawLine(i,j,i,j);
window_gc.drawLine(i,j,i,j);
}
}
draw_all_points();
}
void button_clear_clicked()
{
clear_all();
}
void button_save_clicked()
{
FileDialog dialog = new FileDialog(new Frame(),"Save",FileDialog.SAVE);
dialog.setVisible(true);
String filename = dialog.getDirectory() dialog.getFile();
if (filename == null) return;
try {
DataOutputStream fp = new DataOutputStream(new BufferedOutputStream(new FileOutputStream(filename)));
int n = point_list.size();
for(int i=0;i<n;i )
{
point p = point_list.elementAt(i);
fp.writeBytes(p.value " 1:" p.x " 2:" p.y "\n");
}
fp.close();
} catch (IOException e) { System.err.print(e); }
}
void button_load_clicked()
{
FileDialog dialog = new FileDialog(new Frame(),"Load",FileDialog.LOAD);
dialog.setVisible(true);
String filename = dialog.getDirectory() dialog.getFile();
if (filename == null) return;
clear_all();
try {
BufferedReader fp = new BufferedReader(new FileReader(filename));
String line;
while((line = fp.readLine()) != null)
{
StringTokenizer st = new StringTokenizer(line," \t\n\r\f:");
byte value = (byte)atoi(st.nextToken());
st.nextToken();
double x = atof(st.nextToken());
st.nextToken();
double y = atof(st.nextToken());
point_list.addElement(new point(x,y,value));
}
fp.close();
} catch (IOException e) { System.err.print(e); }
draw_all_points();
}
protected void processMouseEvent(MouseEvent e)
{
if(e.getID() == MouseEvent.MOUSE_PRESSED)
{
if(e.getX() >= XLEN || e.getY() >= YLEN) return;
point p = new point((double)e.getX()/XLEN,
(double)e.getY()/YLEN,
current_value);
point_list.addElement(p);
draw_point(p);
}
}
public void paint(Graphics g)
{
// create buffer first time
if(buffer == null) {
buffer = this.createImage(XLEN,YLEN);
buffer_gc = buffer.getGraphics();
buffer_gc.setColor(colors[0]);
buffer_gc.fillRect(0,0,XLEN,YLEN);
}
g.drawImage(buffer,0,0,this);
}
public Dimension getPreferredSize() { return new Dimension(XLEN,YLEN 50); }
public void setSize(Dimension d) { setSize(d.width,d.height); }
public void setSize(int w,int h) {
super.setSize(w,h);
XLEN = w;
YLEN = h-50;
clear_all();
}
public static void main(String[] argv)
{
new AppletFrame("svm_toy",new svm_toy(),500,500 50);
}
}
class AppletFrame extends Frame {
AppletFrame(String title, Applet applet, int width, int height)
{
super(title);
this.addWindowListener(new WindowAdapter() {
public void windowClosing(WindowEvent e) {
System.exit(0);
}
});
applet.init();
applet.setSize(width,height);
applet.start();
this.add(applet);
this.pack();
this.setVisible(true);
}
}
标签： svm
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