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00012 #ifndef _DISTANCE_H___
00013 #define _DISTANCE_H___
00014
00015 #include <stdio.h>
00016
00017 #include "lib/common.h"
00018 #include "lib/File.h"
00019 #include "lib/Mathematics.h"
00020 #include "base/SGObject.h"
00021 #include "features/Features.h"
00022
00023 namespace shogun
00024 {
00025 class CFile;
00026 class CMath;
00027 class CFeatures;
00028 enum EFeatureType;
00029 enum EFeatureClass;
00030
00031 enum EDistanceType
00032 {
00033 D_UNKNOWN = 0,
00034 D_MINKOWSKI = 10,
00035 D_MANHATTAN = 20,
00036 D_CANBERRA = 30,
00037 D_CHEBYSHEW = 40,
00038 D_GEODESIC = 50,
00039 D_JENSEN = 60,
00040 D_MANHATTANWORD = 70,
00041 D_HAMMINGWORD = 80 ,
00042 D_CANBERRAWORD = 90,
00043 D_SPARSEEUCLIDIAN = 100,
00044 D_EUCLIDIAN = 110,
00045 D_CHISQUARE = 120,
00046 D_TANIMOTO = 130,
00047 D_COSINE = 140,
00048 D_BRAYCURTIS =150
00049 };
00050
00051
00055 class CDistance : public CSGObject
00056 {
00057 public:
00059 CDistance();
00060
00067 CDistance(CFeatures* lhs, CFeatures* rhs);
00068 virtual ~CDistance();
00069
00077 inline float64_t distance(int32_t idx_a, int32_t idx_b)
00078 {
00079 if (idx_a < 0 || idx_b <0)
00080 return 0;
00081
00082 ASSERT(lhs);
00083 ASSERT(rhs);
00084
00085 if (lhs==rhs)
00086 {
00087 int32_t num_vectors = lhs->get_num_vectors();
00088
00089 if (idx_a>=num_vectors)
00090 idx_a=2*num_vectors-1-idx_a;
00091
00092 if (idx_b>=num_vectors)
00093 idx_b=2*num_vectors-1-idx_b;
00094 }
00095
00096 if (precompute_matrix && (precomputed_matrix==NULL) && (lhs==rhs))
00097 do_precompute_matrix() ;
00098
00099 if (precompute_matrix && (precomputed_matrix!=NULL))
00100 {
00101 if (idx_a>=idx_b)
00102 return precomputed_matrix[idx_a*(idx_a+1)/2+idx_b] ;
00103 else
00104 return precomputed_matrix[idx_b*(idx_b+1)/2+idx_a] ;
00105 }
00106
00107 return compute(idx_a, idx_b);
00108 }
00109
00116 void get_distance_matrix(float64_t** dst,int32_t* m, int32_t* n);
00117
00125 virtual float64_t* get_distance_matrix_real(
00126 int32_t &m,int32_t &n, float64_t* target);
00127
00135 virtual float32_t* get_distance_matrix_shortreal(
00136 int32_t &m,int32_t &n,float32_t* target);
00137
00147 virtual bool init(CFeatures* lhs, CFeatures* rhs);
00148
00153 virtual void cleanup()=0;
00154
00159 void load(CFile* loader);
00160
00165 void save(CFile* writer);
00166
00171 inline CFeatures* get_lhs() { SG_REF(lhs); return lhs; };
00172
00177 inline CFeatures* get_rhs() { SG_REF(rhs); return rhs; };
00178
00187 CFeatures* replace_rhs(CFeatures* rhs);
00188
00190 virtual void remove_lhs_and_rhs();
00191
00193 virtual void remove_lhs();
00194
00196 virtual void remove_rhs();
00197
00204 virtual EDistanceType get_distance_type()=0 ;
00205
00212 virtual EFeatureType get_feature_type()=0;
00213
00220 virtual EFeatureClass get_feature_class()=0;
00221
00227 inline bool get_precompute_matrix() { return precompute_matrix ; }
00228
00234 inline virtual void set_precompute_matrix(bool flag)
00235 {
00236 precompute_matrix=flag;
00237
00238 if (!precompute_matrix)
00239 {
00240 delete[] precomputed_matrix;
00241 precomputed_matrix=NULL;
00242 }
00243 }
00244
00249 inline int32_t get_num_vec_lhs()
00250 {
00251 if (!lhs)
00252 return 0;
00253 else
00254 return lhs->get_num_vectors();
00255 }
00256
00261 inline int32_t get_num_vec_rhs()
00262 {
00263 if (!rhs)
00264 return 0;
00265 else
00266 return rhs->get_num_vectors();
00267 }
00268
00273 inline bool has_features()
00274 {
00275 return lhs && rhs;
00276 }
00277
00282 inline bool lhs_equals_rhs()
00283 {
00284 return lhs==rhs;
00285 }
00286
00287 protected:
00291 virtual float64_t compute(int32_t x, int32_t y)=0;
00292
00294 void do_precompute_matrix();
00295
00296 protected:
00300 float32_t * precomputed_matrix;
00301
00305 bool precompute_matrix;
00306
00308 CFeatures* lhs;
00310 CFeatures* rhs;
00311
00312 };
00313 }
00314 #endif