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/*! \file */
/* ************************************************************************
* Copyright (C) 2023 Advanced Micro Devices, Inc. All rights Reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* ************************************************************************ */
#include "rocsparse_vector_utils.hpp"
#include <algorithm>
/*! \brief Perform max norm on an array of complex values. */
template <typename T,
typename std::enable_if<(std::is_same<T, rocsparse_float_complex>::value
|| std::is_same<T, rocsparse_double_complex>::value),
int>::type
= 0>
static void normalize_array(T* v, size_t v_size)
{
if(v_size > 0)
{
auto max_val = std::abs(v[0]);
for(size_t i = 1; i < v_size; i++)
{
max_val = std::max(std::abs(v[i]), max_val);
}
auto factor = static_cast<floating_data_t<T>>(1) / max_val;
for(size_t i = 0; i < v_size; i++)
{
v[i] *= factor;
}
}
}
/*! \brief Perform affine transform of bound [-1, 1] on an array of real values. */
template <typename T,
typename std::enable_if<(std::is_same<T, float>::value || std::is_same<T, double>::value),
int>::type
= 0>
static void normalize_array(T* v, size_t v_size)
{
if(v_size > 0)
{
auto max_val = v[0];
auto min_val = v[0];
for(size_t i = 1; i < v_size; i++)
{
max_val = std::max(v[i], max_val);
min_val = std::min(v[i], min_val);
}
// y = (2x - max - min) / (max - min)
auto denom = static_cast<T>(1) / (max_val - min_val);
for(size_t i = 0; i < v_size; i++)
{
v[i] = (2 * v[i] - max_val - min_val) * denom;
}
}
}
template <typename T>
void rocsparse_vector_utils<T>::normalize(host_dense_vector<T>& v)
{
normalize_array<T>(v.data(), v.size());
}
template <typename T>
void rocsparse_vector_utils<T>::normalize(host_vector<T>& v)
{
normalize_array<T>(v.data(), v.size());
}
#define INSTANTIATE(TYPE) template struct rocsparse_vector_utils<TYPE>;
INSTANTIATE(float);
INSTANTIATE(double);
INSTANTIATE(rocsparse_float_complex);
INSTANTIATE(rocsparse_double_complex);
#undef INSTANTIATE
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