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LocallyLinearEmbedding.cpp
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00001 /*
00002  * This program is free software; you can redistribute it and/or modify
00003  * it under the terms of the GNU General Public License as published by
00004  * the Free Software Foundation; either version 3 of the License, or
00005  * (at your option) any later version.
00006  *
00007  * Written (W) 2011 Sergey Lisitsyn
00008  * Copyright (C) 2011 Berlin Institute of Technology and Max-Planck-Society
00009  */
00010 
00011 #include <shogun/converter/LocallyLinearEmbedding.h>
00012 #include <shogun/lib/config.h>
00013 #ifdef HAVE_EIGEN3
00014 #include <shogun/converter/EmbeddingConverter.h>
00015 #include <shogun/kernel/LinearKernel.h>
00016 #include <shogun/io/SGIO.h>
00017 #include <shogun/lib/Time.h>
00018 #include <shogun/lib/tapkee/tapkee_shogun.hpp>
00019 
00020 using namespace shogun;
00021 
00022 CLocallyLinearEmbedding::CLocallyLinearEmbedding() :
00023         CEmbeddingConverter()
00024 {
00025     m_k = 10;
00026     m_nullspace_shift = -1e-9;
00027     m_reconstruction_shift = 1e-3;
00028     init();
00029 }
00030 
00031 void CLocallyLinearEmbedding::init()
00032 {
00033     SG_ADD(&m_k, "k", "number of neighbors", MS_AVAILABLE);
00034     SG_ADD(&m_nullspace_shift, "nullspace_shift",
00035       "nullspace finding regularization shift",MS_NOT_AVAILABLE);
00036     SG_ADD(&m_reconstruction_shift, "reconstruction_shift",
00037       "shift used to regularize reconstruction step", MS_NOT_AVAILABLE);
00038 }
00039 
00040 
00041 CLocallyLinearEmbedding::~CLocallyLinearEmbedding()
00042 {
00043 }
00044 
00045 void CLocallyLinearEmbedding::set_k(int32_t k)
00046 {
00047     ASSERT(k>0)
00048     m_k = k;
00049 }
00050 
00051 int32_t CLocallyLinearEmbedding::get_k() const
00052 {
00053     return m_k;
00054 }
00055 
00056 void CLocallyLinearEmbedding::set_nullspace_shift(float64_t nullspace_shift)
00057 {
00058     m_nullspace_shift = nullspace_shift;
00059 }
00060 
00061 float64_t CLocallyLinearEmbedding::get_nullspace_shift() const
00062 {
00063     return m_nullspace_shift;
00064 }
00065 
00066 void CLocallyLinearEmbedding::set_reconstruction_shift(float64_t reconstruction_shift)
00067 {
00068     m_reconstruction_shift = reconstruction_shift;
00069 }
00070 
00071 float64_t CLocallyLinearEmbedding::get_reconstruction_shift() const
00072 {
00073     return m_reconstruction_shift;
00074 }
00075 
00076 const char* CLocallyLinearEmbedding::get_name() const
00077 {
00078     return "LocallyLinearEmbedding";
00079 }
00080 
00081 CFeatures* CLocallyLinearEmbedding::apply(CFeatures* features)
00082 {
00083     // oh my let me dirty cast it
00084     CKernel* kernel = new CLinearKernel((CDotFeatures*)features,(CDotFeatures*)features);
00085     TAPKEE_PARAMETERS_FOR_SHOGUN parameters;
00086     parameters.n_neighbors = m_k;
00087     parameters.eigenshift = m_nullspace_shift;
00088     parameters.method = SHOGUN_LOCALLY_LINEAR_EMBEDDING;
00089     parameters.target_dimension = m_target_dim;
00090     parameters.kernel = kernel;
00091     CDenseFeatures<float64_t>* embedding = tapkee_embed(parameters);
00092     SG_UNREF(kernel);
00093     return embedding;
00094 }
00095 
00096 #endif /* HAVE_EIGEN3 */
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