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PNorm.h
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PNorm.h
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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) 2012 Viktor Gal
* Copyright (C) 2012 Viktor Gal
*/
#ifndef _PNORM_ONE__H__
#define _PNORM_ONE__H__
#include <shogun/lib/config.h>
#include <shogun/preprocessor/DensePreprocessor.h>
#include <shogun/features/Features.h>
#include <shogun/lib/common.h>
#include <stdio.h>
namespace shogun
{
/** @brief Preprocessor PNorm, normalizes vectors to have p-norm.
*
* Formally, it computes
*
* \f[
* {\bf x} \leftarrow \frac{{\bf x}}{||{\bf x}||_p}
* \f]
*
*/
class CPNorm : public CDensePreprocessor<float64_t>
{
public:
/** default PNorm Constructor */
CPNorm ();
/** constructor
* @param p the norm to calculate. NOTE: has to be greater or equal than 1.0
*/
CPNorm (double p);
/** destructor */
virtual ~CPNorm ();
/// 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 const char* get_name () const { return "PNorm"; }
/// return a type of preprocessor
virtual EPreprocessorType get_type () const { return P_PNORM; }
/**
* Set norm
* @param pnorm norm value
*/
void set_pnorm (double pnorm);
/**
* Get norm value
* @return norm
*/
double get_pnorm () const;
private:
void register_param ();
inline float64_t get_pnorm (float64_t* vec, int32_t vec_len) const;
private:
double m_p;
};
}
#endif /* _PNORM_ONE__H__ */