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NormOne.h
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NormOne.h
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/*
* This software is distributed under BSD 3-clause license (see LICENSE file).
*
* Authors: Soeren Sonnenburg, Evgeniy Andreev, Yuyu Zhang, Saurabh Goyal,
* Sergey Lisitsyn
*/
#ifndef _CNORM_ONE__H__
#define _CNORM_ONE__H__
#include <shogun/lib/config.h>
#include <shogun/preprocessor/DensePreprocessor.h>
#include <shogun/features/Features.h>
#include <shogun/lib/common.h>
namespace shogun
{
/** @brief Preprocessor NormOne, normalizes vectors to have norm 1.
*
* Formally, it computes
*
* \f[
* {\bf x} \leftarrow \frac{{\bf x}}{||{\bf x}||}
* \f]
*
* It therefore does not need any initialization. It is most useful to get data
* onto a ball of radius one.
*/
class CNormOne : public CDensePreprocessor<float64_t>
{
public:
/** default constructor */
CNormOne();
/** destructor */
virtual ~CNormOne();
/// 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 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 "NormOne"; }
/// return a type of preprocessor
virtual EPreprocessorType get_type() const { return P_NORMONE; }
protected:
virtual SGMatrix<float64_t>
apply_to_matrix(SGMatrix<float64_t> matrix) override;
};
}
#endif