source: trunk/yat/classifier/PolynomialKernelFunction.cc @ 781

Last change on this file since 781 was 781, checked in by Peter, 15 years ago

changing name to ROCScore and also added some cassert includes

  • Property svn:eol-style set to native
  • Property svn:keywords set to Author Date ID
File size: 2.0 KB
Line 
1// $Id$
2
3/*
4  Copyright (C) The authors contributing to this file.
5
6  This file is part of the yat library, http://lev.thep.lu.se/trac/yat
7
8  The yat library is free software; you can redistribute it and/or
9  modify it under the terms of the GNU General Public License as
10  published by the Free Software Foundation; either version 2 of the
11  License, or (at your option) any later version.
12
13  The yat library is distributed in the hope that it will be useful,
14  but WITHOUT ANY WARRANTY; without even the implied warranty of
15  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  General Public License for more details.
17
18  You should have received a copy of the GNU General Public License
19  along with this program; if not, write to the Free Software
20  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
21  02111-1307, USA.
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  averager.add(x,y);
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  averager.add(x,y);
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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