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Last change
on this file since 353 was
353,
checked in by Peter, 17 years ago
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removed function returning the whole matrix. It is not needed anymore and should not be there for simplistic reasons.
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Property svn:eol-style set to
native
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Property svn:keywords set to
Author Date Id Revision
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File size:
945 bytes
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| 1 | // $Id: GaussianKernelFunction.cc 353 2005-06-08 23:28:35Z peter $ |
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| 2 | |
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| 3 | #include <c++_tools/svm/GaussianKernelFunction.h> |
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| 4 | |
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| 5 | #include <c++_tools/svm/KernelFunction.h> |
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| 6 | #include <c++_tools/gslapi/matrix.h> |
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| 7 | #include <c++_tools/gslapi/vector.h> |
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| 8 | |
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| 9 | #include <math.h> |
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| 10 | |
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| 11 | namespace theplu { |
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| 12 | namespace svm { |
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| 13 | |
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| 14 | GaussianKernelFunction::GaussianKernelFunction(double sigma) |
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| 15 | : KernelFunction(), sigma_(sigma) |
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| 16 | { |
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| 17 | } |
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| 18 | |
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| 19 | double GaussianKernelFunction::operator()(const gslapi::vector& a1, |
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| 20 | const gslapi::vector& a2, |
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| 21 | const gslapi::vector& w1, |
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| 22 | const gslapi::vector& w2) const |
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| 23 | { |
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| 24 | double distance = 0; |
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| 25 | double normalization_factor = 0; |
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| 26 | for (size_t i=0; i<a1.size(); i++) { |
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| 27 | distance += w1(i) * w2(i) * (a1(i)-a2(i)) * (a1(i)-a2(i)); |
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| 28 | normalization_factor += w1(i) * w2(i); |
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| 29 | } |
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| 30 | // to make it coherent with no weight case |
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| 31 | normalization_factor /= a1.size(); |
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| 32 | return exp(distance/normalization_factor/pow(sigma_,2)); |
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| 33 | } |
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| 34 | |
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| 35 | |
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| 36 | |
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| 37 | }} // of namespace svn and namespace theplu |
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