sigkernel.java

代码是一个分类器的实现,其中使用了部分weka的源代码。可以将项目导入eclipse运行

package com.lqy.GEP;

import weka.core.EuclideanDistance;
import weka.core.Instance;

public class SigKernel implements Symbol{//不再是SIGMOID函数了
	private double[] parameters=new double[this.getParameterSize()];
	public boolean isTerminal(){
		return true;
	}
	public String getName(){
		return "k3";
	}
	public int getArity(){
		return 0;
	}
	public double eval(double[] argS){
	    return 0;
		
	}
	public int getParameterSize(){
		return 1;
	}
	public void setParameters(double[] argD){
		for(int i=0;i<this.getParameterSize();i++)
			this.parameters[i]=argD[i];
	}
	public double getValue(EuclideanMeasure argE,Instance argIA,Instance argIB){
		
		if(argIA.equals(argIB))
			return 1;
		//double alpha=this.parameters[0];
		double beta=this.parameters[0];
		double tempIPAB=argE.distanceInOriginalSpace(argIA, argIB, Double.MAX_VALUE);
		double tempIPAA=argE.distanceInOriginalSpace(argIA, argIA, Double.MAX_VALUE);
		double tempIPBB=argE.distanceInOriginalSpace(argIB, argIB, Double.MAX_VALUE);
		
	//	System.out.println("Sig");
		
		double AB=Math.pow(Math.sqrt(tempIPAB+beta),-1);
		double AA=Math.pow(Math.sqrt(tempIPAA+beta),-1);
		double BB=Math.pow(Math.sqrt(tempIPBB+beta),-1);
		
		return AB/Math.sqrt(AA*BB);
	}
	public double getValue(double[] argD){//argD[0]
		double beta=this.parameters[0];
		double AB=Math.pow(Math.sqrt(argD[0]+beta),-1);
		double AA=Math.pow(Math.sqrt(argD[1]+beta),-1);
		double BB=Math.pow(Math.sqrt(argD[2]+beta),-1);
	//	System.out.println("Poly");
		
		return AB/Math.sqrt(AA*BB);
        
	}
	public double getValue(double[] argD,Instance argIA,Instance argIB){
		if(argIA.equals(argIB))
			return 1;
		return this.getValue(argD);
	}
}