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JKernelMachines is a java library for learning with kernels. It is primary
designed to deal with custom kernels that are not easily found in standard
libraries, such as kernels on structured data.
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/*******************************************************************************
* Copyright (c) 2016, David Picard.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without modification,
* are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation and/or
* other materials provided with the distribution.
*
* 3. Neither the name of the copyright holder nor the names of its contributors
* may be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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*******************************************************************************/
package net.jkernelmachines.kernel.extra.bag;
import java.io.Serializable;
import java.util.List;
import net.jkernelmachines.kernel.Kernel;
/**
* Default kernel on bags : sum all kernel values involving an element from B1 and an element from B2 between specified bounds.
* the bound can be made different for left and right list, which doesn't lead to a kernel anymore.
* However, this can be a usefull option to debug or view some precise elements of the sum.
* @author dpicard
*
* @param list type
* @param type of element in the bag
*/
public class SubListKernel2> extends Kernel implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1591055803491554966L;
private int fr1 = 0, fr2 = 0;
private int to1 = 0, to2 = 0;
private Kernel kernel;
private double eps = 10e-6;
/**
* @param kernel kernel
* @param fr1 beginning bound for left list (inclusive)
* @param to1 end bound for left list (exclusive)
* @param fr2 beginning bound for right list (inclusive)
* @param to2 end bound for right list (exclusive)
*/
public SubListKernel2(Kernel kernel, int fr1, int to1, int fr2, int to2) {
this.kernel = kernel;
this.fr1 = fr1;
this.to1 = to1;
this.fr2 = fr2;
this.to2 = to2;
}
@Override
public double valueOf(T t1, T t2) {
double sum = 0;
if(to1 > t1.size())
to1 = t1.size();
if(to2 > t2.size())
to2 = t2.size();
for(int i = fr1; i < to1; i++)
for(int j = fr2; j < to2; j++)
{
double d = kernel.valueOf(t1.get(i), t2.get(j));
if(d > eps)
sum += d;
}
return sum/((double)((to1-fr1)*(to2-fr2)));
}
@Override
public double valueOf(T t1) {
return valueOf(t1, t1);
}
}