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ShiftInvariantKernel.cpp
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ShiftInvariantKernel.cpp
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/*
* Copyright (c) The Shogun Machine Learning Toolbox
* Written (w) 2016 Soumyajit De
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* 1. Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* The views and conclusions contained in the software and documentation are those
* of the authors and should not be interpreted as representing official policies,
* either expressed or implied, of the Shogun Development Team.
*/
#include <shogun/lib/common.h>
#include <shogun/kernel/ShiftInvariantKernel.h>
#include <shogun/distance/CustomDistance.h>
using namespace shogun;
CShiftInvariantKernel::CShiftInvariantKernel() : CKernel(0)
{
register_params();
}
CShiftInvariantKernel::CShiftInvariantKernel(CFeatures *l, CFeatures *r) : CKernel(l, r, 0)
{
register_params();
init(l, r);
}
CShiftInvariantKernel::~CShiftInvariantKernel()
{
cleanup();
SG_UNREF(m_distance);
}
bool CShiftInvariantKernel::init(CFeatures* l, CFeatures* r)
{
REQUIRE(m_distance, "The distance instance cannot be NULL!\n");
CKernel::init(l,r);
m_distance->init(l, r);
return init_normalizer();
}
void CShiftInvariantKernel::precompute_distance()
{
REQUIRE(m_distance, "The distance instance cannot be NULL!\n");
REQUIRE(m_distance->init(lhs, rhs), "Could not initialize the distance instance!\n");
SGMatrix<float32_t> dist_mat=m_distance->get_distance_matrix<float32_t>();
if (m_precomputed_distance==NULL)
{
m_precomputed_distance=new CCustomDistance();
SG_REF(m_precomputed_distance);
}
if (lhs==rhs)
m_precomputed_distance->set_triangle_distance_matrix_from_full(dist_mat.data(), dist_mat.num_rows, dist_mat.num_cols);
else
m_precomputed_distance->set_full_distance_matrix_from_full(dist_mat.data(), dist_mat.num_rows, dist_mat.num_cols);
}
void CShiftInvariantKernel::cleanup()
{
SG_UNREF(m_precomputed_distance);
m_precomputed_distance=NULL;
CKernel::cleanup();
}
EDistanceType CShiftInvariantKernel::get_distance_type() const
{
REQUIRE(m_distance, "The distance instance cannot be NULL!\n");
return m_distance->get_distance_type();
}
float64_t CShiftInvariantKernel::distance(int32_t a, int32_t b) const
{
REQUIRE(m_distance, "The distance instance cannot be NULL!\n");
if (m_precomputed_distance!=NULL)
return m_precomputed_distance->distance(a, b);
else
return m_distance->distance(a, b);
}
void CShiftInvariantKernel::register_params()
{
SG_ADD((CSGObject**) &m_distance, "m_distance", "Distance to be used.", MS_NOT_AVAILABLE);
SG_ADD((CSGObject**) &m_precomputed_distance, "m_precomputed_distance", "Precomputed istance to be used.", MS_NOT_AVAILABLE);
m_distance=NULL;
m_precomputed_distance=NULL;
}
void CShiftInvariantKernel::set_precomputed_distance(CCustomDistance* precomputed_distance)
{
REQUIRE(precomputed_distance, "The precomputed distance instance cannot be NULL!\n");
SG_REF(precomputed_distance);
SG_UNREF(m_precomputed_distance);
m_precomputed_distance=precomputed_distance;
}
CCustomDistance* CShiftInvariantKernel::get_precomputed_distance() const
{
REQUIRE(m_precomputed_distance, "The precomputed distance instance cannot be NULL!\n");
SG_REF(m_precomputed_distance);
return m_precomputed_distance;
}