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SplineKernel.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 Sergey Bartunov
8  * Copyright (C) 1999-2009 Fraunhofer Institute FIRST and Max-Planck-Society
9  * Copyright (C) 2010 Berlin Institute of Technology
10  */
11 
12 #include <shogun/lib/config.h>
13 #include <shogun/lib/common.h>
14 #include <shogun/io/SGIO.h>
18 
19 using namespace shogun;
20 
22 {
23 }
24 
26 {
27  init(l,r);
28 }
29 
31 {
32  cleanup();
33 }
34 
35 bool CSplineKernel::init(CFeatures* l, CFeatures* r)
36 {
39 
42 
43  CDotKernel::init(l,r);
44  return init_normalizer();
45 }
46 
48 {
50 }
51 
52 float64_t CSplineKernel::compute(int32_t idx_a, int32_t idx_b)
53 {
54  int32_t alen, blen;
55  bool afree, bfree;
56 
57  float64_t* avec = ((CDenseFeatures<float64_t>*) lhs)->get_feature_vector(idx_a, alen, afree);
58  float64_t* bvec = ((CDenseFeatures<float64_t>*) rhs)->get_feature_vector(idx_b, blen, bfree);
59  ASSERT(alen == blen)
60 
61  float64_t result = 0;
62  for (int32_t i = 0; i < alen; i++) {
63  const float64_t x = avec[i], y = bvec[i];
64  const float64_t min = CMath::min(avec[i], bvec[i]);
65  result += 1 + x*y + x*y*min - ((x+y)/2)*min*min + min*min*min/3;
66  }
67 
68  ((CDenseFeatures<float64_t>*) lhs)->free_feature_vector(avec, idx_a, afree);
69  ((CDenseFeatures<float64_t>*) rhs)->free_feature_vector(bvec, idx_b, bfree);
70 
71  return result;
72 }

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