LatentSOSVM.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) 2012 Viktor Gal
00008  * Copyright (C) 2012 Viktor Gal
00009  */
00010 
00011 #include <shogun/latent/LatentSOSVM.h>
00012 #include <shogun/structure/DualLibQPBMSOSVM.h>
00013 
00014 using namespace shogun;
00015 
00016 CLatentSOSVM::CLatentSOSVM()
00017     : CLinearLatentMachine()
00018 {
00019     register_parameters();
00020 }
00021 
00022 CLatentSOSVM::CLatentSOSVM(CLatentModel* model, CLinearStructuredOutputMachine* so_solver, float64_t C)
00023     : CLinearLatentMachine(model, C)
00024 {
00025     register_parameters();
00026     set_so_solver(so_solver);
00027 }
00028 
00029 CLatentSOSVM::~CLatentSOSVM()
00030 {
00031     SG_UNREF(m_so_solver);
00032 }
00033 
00034 CLatentLabels* CLatentSOSVM::apply_latent()
00035 {
00036     return NULL;
00037 }
00038 
00039 void CLatentSOSVM::set_so_solver(CLinearStructuredOutputMachine* so)
00040 {
00041     SG_UNREF(m_so_solver);
00042     SG_REF(so);
00043     m_so_solver = so;
00044 }
00045 
00046 float64_t CLatentSOSVM::do_inner_loop(float64_t cooling_eps)
00047 {
00048     float64_t lambda = 1/m_C;
00049     CDualLibQPBMSOSVM* so = new CDualLibQPBMSOSVM();
00050     so->set_lambda(lambda);
00051     so->train();
00052 
00053     /* copy the resulting w */
00054     SGVector<float64_t> cur_w = so->get_w();
00055     memcpy(w.vector, cur_w.vector, cur_w.vlen*sizeof(float64_t));
00056 
00057     /* get the primal objective value */
00058     float64_t po = so->get_result().Fp;
00059 
00060     SG_UNREF(so);
00061 
00062     return po;
00063 }
00064 
00065 void CLatentSOSVM::register_parameters()
00066 {
00067     m_parameters->add((CSGObject**)&m_so_solver, "so_solver", "Structured Output Solver.");
00068 }
00069 
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