84 lines
1.9 KiB
C++
84 lines
1.9 KiB
C++
#pragma once
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#include <cstdint> //uint64_t
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//#include <stdexcept> // std::runtime_error
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#include "utils/vector.h"
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#include "utils/matrix.h"
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namespace numerics::detail{
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// ---------------- Matrix -> Scalar ----------------
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template <typename T>
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utils::Vector<uint64_t> argmax_serial(const utils::Matrix<T>& A) {
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const uint64_t rows = A.rows();
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const uint64_t cols = A.cols();
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utils::Vector<uint64_t> idx(2, 0);
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T max = A(0,0);
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for (uint64_t i = 0; i < rows; ++i){
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for (uint64_t j = 0; j < cols; ++j){
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if (max < A(i,j)){
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max = A(i,j);
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idx[0] = i;
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idx[1] = j;
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}
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}
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}
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return idx;
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}
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// ---------------- Vector -> Scalar ----------------
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template <typename T>
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uint64_t argmax_serial(const utils::Vector<T>& v) {
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const uint64_t N = v.size();
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uint64_t idx = 0;
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T max = v[0];
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for (uint64_t i = 1; i < N; ++i){
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if (max < v[i]){
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max = v[i];
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idx = i;
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}
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}
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return idx;
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}
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// ---------------- Matrix -> Vector ----------------
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template <typename T>
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utils::Vector<uint64_t> argmax_rowwise_serial(const utils::Matrix<T>& A) {
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const uint64_t rows = A.rows();
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const uint64_t cols = A.cols();
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utils::Vector<T> max(rows, T{0});
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utils::Vector<uint64_t> idx(rows, 0);
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for (uint64_t i = 0; i < rows; ++i){
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max[i] = A(i,0);
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for (uint64_t j = 1; j < cols; ++j){
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if (max[i] < A(i,j)){
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max[i] = A(i,j);
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idx[i] = j;
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}
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}
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}
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return idx;
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}
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template <typename T>
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utils::Vector<uint64_t> argmax_colwise_serial(const utils::Matrix<T>& A) {
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const uint64_t rows = A.rows();
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const uint64_t cols = A.cols();
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utils::Vector<T> max(cols, T{0});
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utils::Vector<uint64_t> idx(cols, 0);
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for (uint64_t j = 0; j < cols; ++j){
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max[j] = A(0, j);
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for (uint64_t i = 1; i < rows; ++i){
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if (max[j] < A(i,j)){
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max[j] = A(i,j);
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idx[j] = i;
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}
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}
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}
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return idx;
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}
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} // namespace numerics
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