SHOGUN  v1.1.0
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Macros Pages
CanberraMetric.cpp
Go to the documentation of this file.
1 /*
2  * This program is free software; you can redistribute it and/or modify
3  * it under the terms of the GNU General Public License as published by
4  * the Free Software Foundation; either version 3 of the License, or
5  * (at your option) any later version.
6  *
7  * Written (W) 2006-2009 Christian Gehl
8  * Copyright (C) 2006-2009 Fraunhofer Institute FIRST
9  */
10 
11 #include <shogun/lib/config.h>
12 #include <shogun/lib/common.h>
13 #include <shogun/io/SGIO.h>
17 
18 using namespace shogun;
19 
22 {
23 }
24 
27 {
28  init(l, r);
29 }
30 
32 {
33  cleanup();
34 }
35 
36 bool CCanberraMetric::init(CFeatures* l, CFeatures* r)
37 {
38  bool result=CSimpleDistance<float64_t>::init(l,r);
39 
40  return result;
41 }
42 
44 {
45 }
46 
47 float64_t CCanberraMetric::compute(int32_t idx_a, int32_t idx_b)
48 {
49 
50  int32_t alen, blen;
51  bool afree, bfree;
52 
53  float64_t* avec=
54  ((CSimpleFeatures<float64_t>*) lhs)->get_feature_vector(idx_a, alen, afree);
55  float64_t* bvec=
56  ((CSimpleFeatures<float64_t>*) rhs)->get_feature_vector(idx_b, blen, bfree);
57 
58  ASSERT(alen==blen);
59 
60  float64_t absTmp = 0;
61  float64_t result=0;
62  {
63  for (int32_t i=0; i<alen; i++)
64  {
65  absTmp=fabs(avec[i])+fabs(bvec[i]);
66  if(absTmp!=0)
67  result+=fabs(avec[i]-fabs(bvec[i]))/absTmp;
68  }
69 
70  }
71 
72  ((CSimpleFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
73  ((CSimpleFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
74 
75  return result;
76 }

SHOGUN Machine Learning Toolbox - Documentation