| double Impala::Core::Vector::Chi2Distance | ( | const Vector::VectorTem< double > & | v1, | |
| const Vector::VectorTem< double > & | v2 | |||
| ) | [inline] |
Definition at line 22 of file Chi2Distance.h.
References Impala::Core::Vector::VectorTem< ElemT >::Size().
Referenced by Impala::Application::Precompute::ComputeMatrix(), and Impala::Core::Training::ApplyConceptsHelperKernels::LoadFeatures().
00024 { 00025 int length = v1.Size(); 00026 double accumulator = 0; 00027 for (int i=0 ; i<length ; i++) 00028 { 00029 double sum = v1[i] + v2[i]; 00030 if (sum) 00031 accumulator += (v1[i] - v2[i]) * (v1[i] - v2[i]) / sum; 00032 } 00033 // make it between 0..1, instead of 0..2 (this statement is only true if 00034 // the input vectors sum to one) 00035 return accumulator / 2.0; 00036 }
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