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AttenuatedEuclideanDistance.cpp
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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) 2011 Miguel Angel Bautista
8  * Copyright (C) 2011 Berlin Institute of Technology and Max Planck Society
9  */
10 
11 #include <shogun/lib/common.h>
12 #include <shogun/io/SGIO.h>
15 
16 using namespace shogun;
17 
19 {
20  init();
21 }
22 
24 : CRealDistance()
25 {
26  init();
27  init(l, r);
28 }
29 
31 {
32  cleanup();
33 }
34 
35 bool CAttenuatedEuclideanDistance::init(CFeatures* l, CFeatures* r)
36 {
37  CRealDistance::init(l, r);
38  return true;
39 }
40 
42 {
43 }
44 
45 float64_t CAttenuatedEuclideanDistance::compute(int32_t idx_a, int32_t idx_b)
46 {
47  int32_t alen, blen;
48  bool afree, bfree;
49  float64_t result=0;
50 
52  get_feature_vector(idx_a, alen, afree);
54  get_feature_vector(idx_b, blen, bfree);
55  ASSERT(alen==blen)
56 
57  for (int32_t i=0; i<alen; i++)
58  result+=(CMath::abs(avec[i])*CMath::abs(bvec[i]))*CMath::pow(avec[i] - bvec[i],2);
59 
60  ((CDenseFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
61  ((CDenseFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
62 
63  if (disable_sqrt)
64  return result;
65 
66  return CMath::sqrt(result);
67 }
68 
69 void CAttenuatedEuclideanDistance::init()
70 {
71  disable_sqrt=false;
72 
73  m_parameters->add(&disable_sqrt, "disable_sqrt", "If sqrt shall not be applied.");
74 }

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