KernelPCA.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) 2011 Soeren Sonnenburg
 * Copyright (C) 2011 Berlin Institute of Technology
 */

#ifndef KERNELPCA_H__
#define KERNELPCA_H__
#include <shogun/lib/config.h>
#ifdef HAVE_LAPACK

#include <shogun/preprocessor/DimensionReductionPreprocessor.h>
#include <shogun/features/Features.h>
#include <shogun/kernel/Kernel.h>
#include <shogun/lib/common.h>

namespace shogun
{

class CFeatures;
class CKernel;

class CKernelPCA: public CDimensionReductionPreprocessor
{
public:
        CKernelPCA();

        CKernelPCA(CKernel* k);

        virtual ~CKernelPCA();

        virtual bool init(CFeatures* features);
        virtual void cleanup();

        virtual SGMatrix<float64_t> apply_to_feature_matrix(CFeatures* features);

        virtual SGVector<float64_t> apply_to_feature_vector(SGVector<float64_t> vector);

        virtual CSimpleFeatures<float64_t>* apply_to_string_features(CFeatures* features);

        CKernel* get_kernel() const
        {
            SG_REF(m_kernel);
            return m_kernel;
        }

        void set_kernel(CKernel* k)
        {
            SG_REF(k);
            SG_UNREF(m_kernel);
            m_kernel=k;
        }

        SGMatrix<float64_t> get_transformation_matrix() const
        {
            return m_transformation_matrix;
        }

        SGVector<float64_t> get_bias_vector() const
        {
            return m_bias_vector;
        }

        virtual inline const char* get_name() const { return "KernelPCA"; }

        virtual inline EPreprocessorType get_type() const { return P_KERNELPCA; }

    protected:

        void init();

    protected:

        CFeatures* m_init_features;

        SGMatrix<float64_t> m_transformation_matrix;

        SGVector<float64_t> m_bias_vector;

        bool m_initialized;

        CKernel* m_kernel;
};
}
#endif
#endif