1 | // $Id$ |
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2 | |
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3 | /* |
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4 | Copyright (C) The authors contributing to this file. |
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5 | |
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6 | This file is part of the yat library, http://lev.thep.lu.se/trac/yat |
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7 | |
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8 | The yat library is free software; you can redistribute it and/or |
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9 | modify it under the terms of the GNU General Public License as |
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10 | published by the Free Software Foundation; either version 2 of the |
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11 | License, or (at your option) any later version. |
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12 | |
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13 | The yat library is distributed in the hope that it will be useful, |
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14 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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16 | General Public License for more details. |
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17 | |
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18 | You should have received a copy of the GNU General Public License |
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19 | along with this program; if not, write to the Free Software |
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20 | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA |
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21 | 02111-1307, USA. |
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22 | */ |
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23 | |
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24 | #include "PolynomialKernelFunction.h" |
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25 | #include "DataLookup1D.h" |
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26 | #include "DataLookupWeighted1D.h" |
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27 | #include "yat/statistics/AveragerPairWeighted.h" |
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28 | |
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29 | #include <cassert> |
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30 | #include <cmath> |
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31 | |
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32 | namespace theplu { |
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33 | namespace yat { |
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34 | namespace classifier { |
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35 | |
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36 | PolynomialKernelFunction::PolynomialKernelFunction(int order) |
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37 | : KernelFunction(), order_(order) |
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38 | { |
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39 | } |
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40 | |
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41 | |
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42 | double PolynomialKernelFunction::operator()(const DataLookup1D& x, |
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43 | const DataLookup1D& y) const |
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44 | { |
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45 | assert(x.size()==y.size()); |
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46 | return ((order_>1) ? pow(1+x*y,order_) : x*y); |
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47 | } |
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48 | |
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49 | |
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50 | double PolynomialKernelFunction::operator()(const DataLookup1D& x, |
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51 | const DataLookupWeighted1D& y) const |
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52 | { |
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53 | assert(x.size()==y.size()); |
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54 | statistics::AveragerPairWeighted averager; |
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55 | averager.add(x,y); |
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56 | if(order_>1) |
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57 | return pow(1+averager.sum_xy(),order_); |
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58 | return averager.sum_xy(); |
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59 | } |
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60 | |
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61 | |
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62 | double PolynomialKernelFunction::operator()(const DataLookupWeighted1D& x, |
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63 | const DataLookupWeighted1D& y) const |
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64 | { |
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65 | assert(x.size()==y.size()); |
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66 | statistics::AveragerPairWeighted averager; |
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67 | averager.add(x,y); |
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68 | if(order_>1) |
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69 | return pow(1+averager.sum_xy(),order_); |
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70 | return averager.sum_xy(); |
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71 | } |
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72 | |
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73 | |
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74 | }}} // of namespace cpptools, yat, and theplu |
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