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DiffusionMaps.h
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DiffusionMaps.h
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/*
* This software is distributed under BSD 3-clause license (see LICENSE file).
*
* Authors: Sergey Lisitsyn, Heiko Strathmann, Evan Shelhamer, Bjoern Esser
*/
#ifndef DIFFUSIONMAPS_H_
#define DIFFUSIONMAPS_H_
#include <shogun/lib/config.h>
#include <shogun/converter/EmbeddingConverter.h>
#include <shogun/features/Features.h>
#include <shogun/kernel/Kernel.h>
namespace shogun
{
class CFeatures;
class CKernel;
/** @brief class DiffusionMaps used to preprocess given data
* using Diffusion Maps dimensionality
* reduction technique as described in
*
* Coifman, R., & Lafon, S. (2006).
* Diffusion maps.
* Applied and Computational Harmonic Analysis, 21(1), 5-30. Elsevier.
* Retrieved from http://linkinghub.elsevier.com/retrieve/pii/S1063520306000546
*
* Uses implementation from the Tapkee library.
*
* To use this converter with static interfaces please refer it by
* sg('create_converter','diffusion_maps',t,width);
*
*/
class CDiffusionMaps: public CEmbeddingConverter
{
public:
/** constructor */
CDiffusionMaps();
/** destructor */
virtual ~CDiffusionMaps();
/** apply preprocessor to features
* @param features
*/
virtual CFeatures* apply(CFeatures* features, bool inplace = true);
/** embed distance
* @param distance to use for embedding
* @return embedding simple features
*/
virtual CDenseFeatures<float64_t>* embed_distance(CDistance* distance);
/** setter for t parameter
* @param t t value
*/
void set_t(int32_t t);
/** getter for t parameter
* @return t value
*/
int32_t get_t() const;
/** setter for width parameter
* @param width width value
*/
void set_width(float64_t width);
/** getter for width parameter
* @return width value
*/
float64_t get_width() const;
/** get name */
virtual const char* get_name() const;
protected:
/** default init */
void init();
protected:
/** number of steps */
int32_t m_t;
/** gaussian kernel width */
float64_t m_width;
};
}
#endif /* DIFFUSIONMAPS_H_ */