/usr/include/shogun/kernel/SplineKernel.h is in libshogun-dev 1.1.0-4ubuntu2.
This file is owned by root:root, with mode 0o644.
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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) 2011 Sergey Bartunov
* Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
* Copyright (C) 2010 Berlin Institute of Technology
*/
#ifndef _SPLINEKERNEL_H__
#define _SPLINEKERNEL_H__
#include <shogun/lib/common.h>
#include <shogun/kernel/DotKernel.h>
#include <shogun/features/DotFeatures.h>
#include <shogun/machine/KernelMachine.h>
namespace shogun
{
class CKernelMachine;
class CDotFeatures;
/** @brief Computes the Spline Kernel function which is the cubic polynomial
*
* The formula is:
*
* \f[
* k({\bf x},{\bf x'})= 1 + {\bf x} \cdot {\bf x'} +
* {\bf x} \cdot {\bf x'} \cdot \mbox{min}(\bf x, \bf x') -
* \frac{\bf x + \bf x'}{2} \cdot \mbox{min}(\bf x, \bf x')^2 +
* \frac{ \mbox{min}(\bf x, \bf x')^3}{3}
* \f]
*/
class CSplineKernel: public CDotKernel
{
public:
/** constructor
*/
CSplineKernel();
/** constructor
*
* @param l features of left-hand side
* @param r features of right-hand side
*/
CSplineKernel(CDotFeatures* l, CDotFeatures* r);
virtual ~CSplineKernel();
/** 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);
/** clean up kernel */
virtual void cleanup();
/** return what type of kernel we are
*
* @return kernel type SPLINE
*/
virtual EKernelType get_kernel_type() { return K_SPLINE; }
/** return the kernel's name
*
* @return name Spline
*/
virtual const char* get_name() const { return "SplineKernel"; }
protected:
virtual float64_t compute(int32_t idx_a, int32_t idx_b);
};
}
#endif /* _SPLINEKERNEL_H__ */
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