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/*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 3 of the License, or
* (at your option) any later version.
*
* Written (W) 1999-2008 Gunnar Raetsch
* Copyright (C) 1999-2008 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef _AUCKERNEL_H___
#define _AUCKERNEL_H___
#include "lib/common.h"
#include "kernel/SimpleKernel.h"
#include "features/WordFeatures.h"
/** kernel AUC */
class CAUCKernel: public CSimpleKernel<WORD>
{
public:
/** constructor
*
* @param size cache size
* @param subkernel the subkernel
*/
CAUCKernel(INT size, CKernel* subkernel);
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
* @param subkernel the subkernel
*/
CAUCKernel(CWordFeatures *l, CWordFeatures *r, CKernel* subkernel);
virtual ~CAUCKernel();
/** initialize kernel
*
* @param l features of left-hand side
* @param r features of right-hand side
* @return if initializing was successful
*/
virtual bool init(CFeatures* l, CFeatures* r);
/** load kernel init_data
*
* @param src file to load from
* @return if loading was successful
*/
virtual bool load_init(FILE* src);
/** save kernel init_data
*
* @param dest file to save to
* @return if saving was successful
*/
virtual bool save_init(FILE* dest);
/** return what type of kernel we are
*
* @return kernel type AUC
*/
virtual EKernelType get_kernel_type() { return K_AUC; }
/** return the kernel's name
*
* @return name AUC
*/
virtual const CHAR* get_name() { return "AUC" ; }
protected:
/** compute kernel function for features a and b
* idx_{a,b} denote the index of the feature vectors
* in the corresponding feature object
*
* @param idx_a index a
* @param idx_b index b
* @return computed kernel function at indices a,b
*/
virtual DREAL compute(INT idx_a, INT idx_b);
protected:
/** the subkernel */
CKernel* subkernel;
};
#endif /* _AUCKERNEL_H__ */
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