source: trunk/yat/classifier/PolynomialKernelFunction.cc @ 1580

Last change on this file since 1580 was 1487, checked in by Jari Häkkinen, 13 years ago

Addresses #436. GPL license copy reference should also be updated.

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 2.1 KB
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1// $Id$
2
3/*
4  Copyright (C) 2003 Peter Johansson
5  Copyright (C) 2004, 2005, 2006, 2007 Jari Häkkinen, Peter Johansson
6  Copyright (C) 2008 Peter Johansson
7
8  This file is part of the yat library, http://dev.thep.lu.se/yat
9
10  The yat library is free software; you can redistribute it and/or
11  modify it under the terms of the GNU General Public License as
12  published by the Free Software Foundation; either version 3 of the
13  License, or (at your option) any later version.
14
15  The yat library is distributed in the hope that it will be useful,
16  but WITHOUT ANY WARRANTY; without even the implied warranty of
17  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18  General Public License for more details.
19
20  You should have received a copy of the GNU General Public License
21  along with yat. If not, see <http://www.gnu.org/licenses/>.
22*/
23
24#include "PolynomialKernelFunction.h"
25#include "DataLookup1D.h"
26#include "DataLookupWeighted1D.h"
27#include "yat/statistics/AveragerPairWeighted.h"
28
29#include <cassert>
30#include <cmath>
31
32namespace theplu {
33namespace yat {
34namespace classifier { 
35
36PolynomialKernelFunction::PolynomialKernelFunction(int order) 
37  : KernelFunction(), order_(order)
38{
39}
40
41
42double PolynomialKernelFunction::operator()(const DataLookup1D& x,
43                                            const DataLookup1D& y) const   
44{ 
45  assert(x.size()==y.size());
46  return ((order_>1) ? pow(1+x*y,order_) : x*y); 
47}
48
49
50double PolynomialKernelFunction::operator()(const DataLookup1D& x,
51                                            const DataLookupWeighted1D& y) const
52{ 
53  assert(x.size()==y.size());
54  statistics::AveragerPairWeighted averager;
55  add(averager, x.begin(),x.end(), y.begin());
56  if(order_>1) 
57    return pow(1+averager.sum_xy(),order_);
58  return averager.sum_xy();
59}
60
61
62double PolynomialKernelFunction::operator()(const DataLookupWeighted1D& x,
63                                            const DataLookupWeighted1D& y) const
64{ 
65  assert(x.size()==y.size());
66  statistics::AveragerPairWeighted averager;
67  add(averager, x.begin(), x.end(),y.begin());
68  if(order_>1) 
69    return pow(1+averager.sum_xy(),order_);
70  return averager.sum_xy();
71}
72
73
74}}} // of namespace cpptools, yat, and theplu
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