/usr/include/shogun/mathematics/Loss.h is in libshogun-dev 1.1.0-4ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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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 Siddharth Kherada
* Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef __LOSS_H_
#define __LOSS_H_
#include <shogun/lib/common.h>
#include <shogun/io/SGIO.h>
//#include <shogun/mathematics/lapack.h>
//#include <shogun/base/SGObject.h>
//#include <shogun/base/Parallel.h>
// Available losses
#define HINGELOSS 1
#define SMOOTHHINGELOSS 2
#define SQUAREDHINGELOSS 3
#define LOGLOSS 10
#define LOGLOSSMARGIN 11
// Select loss
#define LOSS HINGELOSS
namespace shogun
{
/** @brief Class which collects generic mathematical functions
*/
class CLoss
{
public:
/**@name Constructor/Destructor.
*/
//@{
///Constructor - initializes log-table
CLoss();
///Destructor - frees logtable
virtual ~CLoss();
//@}
/** loss
* @param z
*/
static inline float64_t loss(float64_t z)
{
#if LOSS == LOGLOSS
if (z >= 0)
return log(1+exp(-z));
else
return -z + log(1+exp(z));
#elif LOSS == LOGLOSSMARGIN
if (z >= 1)
return log(1+exp(1-z));
else
return 1-z + log(1+exp(z-1));
#elif LOSS == SMOOTHHINGELOSS
if (z < 0)
return 0.5 - z;
if (z < 1)
return 0.5 * (1-z) * (1-z);
return 0;
#elif LOSS == SQUAREDHINGELOSS
if (z < 1)
return 0.5 * (1 - z) * (1 - z);
return 0;
#elif LOSS == HINGELOSS
if (z < 1)
return 1 - z;
return 0;
#else
# error "Undefined loss"
#endif
}
/** dloss
* @param z
*/
static inline float64_t dloss(float64_t z)
{
#if LOSS == LOGLOSS
if (z < 0)
return 1 / (exp(z) + 1);
float64_t ez = exp(-z);
return ez / (ez + 1);
#elif LOSS == LOGLOSSMARGIN
if (z < 1)
return 1 / (exp(z-1) + 1);
float64_t ez = exp(1-z);
return ez / (ez + 1);
#elif LOSS == SMOOTHHINGELOSS
if (z < 0)
return 1;
if (z < 1)
return 1-z;
return 0;
#elif LOSS == SQUAREDHINGELOSS
if (z < 1)
return (1 - z);
return 0;
#else
if (z < 1)
return 1;
return 0;
#endif
}
};
}
#endif
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