MultitaskKernelMklNormalizer.h

Go to the documentation of this file.
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) 2010 Christian Widmer
00008  * Copyright (C) 2010 Max-Planck-Society
00009  */
00010 
00011 #ifndef _MULTITASKKERNELMKLNORMALIZER_H___
00012 #define _MULTITASKKERNELMKLNORMALIZER_H___
00013 
00014 #include <shogun/kernel/KernelNormalizer.h>
00015 #include <shogun/kernel/MultitaskKernelMklNormalizer.h>
00016 #include <shogun/kernel/Kernel.h>
00017 #include <algorithm>
00018 #include <string>
00019 
00020 namespace shogun
00021 {
00022 
00023 
00027 class CMultitaskKernelMklNormalizer: public CKernelNormalizer
00028 {
00029 
00030 public:
00031 
00034     CMultitaskKernelMklNormalizer() : CKernelNormalizer(), scale(1.0)
00035     {
00036         m_type = N_MULTITASK;
00037     }
00038 
00039 
00042     virtual bool init(CKernel* k)
00043     {
00044 
00045         //same as first-element normalizer
00046         CFeatures* old_lhs=k->lhs;
00047         CFeatures* old_rhs=k->rhs;
00048         k->lhs=old_lhs;
00049         k->rhs=old_lhs;
00050 
00051         if (std::string(k->get_name()) == "WeightedDegree") {
00052             SG_INFO("using first-element normalization\n");
00053             scale=k->compute(0, 0);
00054         } else {
00055             SG_INFO("no inner normalization for non-WDK kernel\n");
00056             scale=1.0;
00057         }
00058 
00059 
00060         k->lhs=old_lhs;
00061         k->rhs=old_rhs;
00062 
00063         ASSERT(k);
00064         int32_t num_lhs = k->get_num_vec_lhs();
00065         int32_t num_rhs = k->get_num_vec_rhs();
00066         ASSERT(num_lhs>0);
00067         ASSERT(num_rhs>0);
00068 
00069 
00070         return true;
00071     }
00072 
00073 
00074 
00079     inline virtual float64_t normalize_lhs(float64_t value, int32_t idx_lhs)
00080     {
00081         SG_ERROR("normalize_lhs not implemented");
00082         return 0;
00083     }
00084 
00089     inline virtual float64_t normalize_rhs(float64_t value, int32_t idx_rhs)
00090     {
00091         SG_ERROR("normalize_rhs not implemented");
00092         return 0;
00093     }
00094 
00095 public:
00096 
00097 
00101     virtual float64_t get_beta(int32_t idx) = 0;
00102 
00107     virtual void set_beta(int32_t idx, float64_t weight) = 0;
00108 
00109 
00113     virtual int32_t get_num_betas() = 0;
00114 
00115 
00117     inline virtual const char* get_name() const
00118     {
00119         return "MultitaskKernelMklNormalizer";
00120     }
00121 
00122 protected:
00123 
00124 
00126     float64_t scale;
00127 
00128 };
00129 }
00130 #endif
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Defines

SHOGUN Machine Learning Toolbox - Documentation