/usr/include/shogun/preprocessor/LogPlusOne.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) 1999-2009 Soeren Sonnenburg
* Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
*/
#ifndef _CLOGPLUSONE__H__
#define _CLOGPLUSONE__H__
#include <shogun/preprocessor/SimplePreprocessor.h>
#include <shogun/features/Features.h>
#include <shogun/lib/common.h>
#include <stdio.h>
namespace shogun
{
/** @brief Preprocessor LogPlusOne does what the name says, it adds one to a dense
* real valued vector and takes the logarithm of each component of it.
*
* \f[
* {\bf x}\leftarrow \log({\bf x}+{\bf 1})
* \f]
* It therefore does not need any initialization. It is most useful in
* situations where the inputs are counts: When one compares differences of
* small counts any difference may matter a lot, while small differences in
* large counts don't. This is what this log transformation controls for.
*/
class CLogPlusOne : public CSimplePreprocessor<float64_t>
{
public:
/** default constructor */
CLogPlusOne();
/** destructor */
virtual ~CLogPlusOne();
/// initialize preprocessor from features
virtual bool init(CFeatures* features);
/// cleanup
virtual void cleanup();
/// initialize preprocessor from file
virtual bool load(FILE* f);
/// save preprocessor init-data to file
virtual bool save(FILE* f);
/// apply preproc on feature matrix
/// result in feature matrix
/// return pointer to feature_matrix, i.e. f->get_feature_matrix();
virtual SGMatrix<float64_t> apply_to_feature_matrix(CFeatures* features);
/// apply preproc on single feature vector
/// result in feature matrix
virtual SGVector<float64_t> apply_to_feature_vector(SGVector<float64_t> vector);
/** @return object name */
virtual inline const char* get_name() const { return "LogPlusOne"; }
/// return a type of preprocessor
virtual inline EPreprocessorType get_type() const { return P_LOGPLUSONE; }
};
}
#endif
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