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/*
Copyright (C) 2024 Sutou Kouhei <kou@clear-code.com>
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "grn_distance.hpp"
namespace grn {
namespace distance {
template <typename Arch, typename ElementType>
float
l2_norm::operator()(Arch, const ElementType *vector_raw, size_t n_elements)
{
float square_sum = 0;
for (size_t i = 0; i < n_elements; ++i) {
square_sum += vector_raw[i] * vector_raw[i];
}
return std::sqrt(square_sum);
}
template <typename Arch, typename ElementType>
float
difference_l1_norm::operator()(Arch,
const ElementType *vector_raw1,
const ElementType *vector_raw2,
size_t n_elements)
{
float absolute_sum = 0;
for (size_t i = 0; i < n_elements; ++i) {
auto difference = vector_raw1[i] - vector_raw2[i];
absolute_sum += difference < 0 ? -difference : difference;
}
return absolute_sum;
}
template <typename Arch, typename ElementType>
float
difference_l2_norm_squared::operator()(Arch,
const ElementType *vector_raw1,
const ElementType *vector_raw2,
size_t n_elements)
{
float square_sum = 0;
for (size_t i = 0; i < n_elements; ++i) {
auto difference = vector_raw1[i] - vector_raw2[i];
square_sum += difference * difference;
}
return square_sum;
}
template <typename Arch, typename ElementType>
float
inner_product::operator()(Arch,
const ElementType *vector_raw1,
const ElementType *vector_raw2,
size_t n_elements)
{
float multiplication_sum = 0;
for (size_t i = 0; i < n_elements; ++i) {
multiplication_sum += vector_raw1[i] * vector_raw2[i];
}
return multiplication_sum;
}
template <typename Arch, typename ElementType>
float
cosine::operator()(Arch,
const ElementType *vector_raw1,
const ElementType *vector_raw2,
size_t n_elements)
{
ElementType inner_product = 0;
ElementType square_sum1 = 0;
ElementType square_sum2 = 0;
for (size_t i = 0; i < n_elements; ++i) {
ElementType value1 = vector_raw1[i];
ElementType value2 = vector_raw2[i];
inner_product += value1 * value2;
square_sum1 += value1 * value1;
square_sum2 += value2 * value2;
}
if (numeric::is_zero(inner_product)) {
return 1;
} else {
return 1 - (inner_product /
(std::sqrt(square_sum1) * std::sqrt(square_sum2)));
}
}
} // namespace distance
} // namespace grn
#define GRN_INSTANTIATION_SIMSIMD_ARCH serial
#define GRN_INSTANTIATION_XSIMD_ARCH xsimd::common
#include "grn_distance_instantiation.hpp"
#undef GRN_INSTANTIATION_SIMSIMD_ARCH
#undef GRN_INSTANTIATION_XSIMD_ARCH
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