多线程并行计算卷积的C++代码
时间: 2023-10-21 16:09:29 浏览: 45
以下是一个基于OpenMP的多线程并行计算卷积的C++代码:
```
#include <iostream>
#include <vector>
#include <omp.h>
using namespace std;
vector<vector<double>> calculate_convolution(const vector<vector<double>>& input, const vector<vector<double>>& kernel)
{
int input_height = input.size();
int input_width = input[0].size();
int kernel_height = kernel.size();
int kernel_width = kernel[0].size();
int output_height = input_height - kernel_height + 1;
int output_width = input_width - kernel_width + 1;
vector<vector<double>> output(output_height, vector<double>(output_width));
#pragma omp parallel for
for (int i = 0; i < output_height; i++)
{
for (int j = 0; j < output_width; j++)
{
double sum = 0.0;
for (int k = 0; k < kernel_height; k++)
{
for (int l = 0; l < kernel_width; l++)
{
sum += input[i + k][j + l] * kernel[k][l];
}
}
output[i][j] = sum;
}
}
return output;
}
int main()
{
vector<vector<double>> input = {{1, 2, 3, 4}, {5, 6, 7, 8}, {9, 10, 11, 12}};
vector<vector<double>> kernel = {{1, 1}, {1, 1}};
vector<vector<double>> output = calculate_convolution(input, kernel);
for (int i = 0; i < output.size(); i++)
{
for (int j = 0; j < output[0].size(); j++)
{
cout << output[i][j] << " ";
}
cout << endl;
}
return 0;
}
```
在这个例子中,我们使用了OpenMP库来实现并行计算卷积。通过使用`#pragma omp parallel for`指令,我们将卷积的计算任务分配给了多个线程。在这个例子中,我们假设输入和卷积核都是方形的,但可以通过修改代码来适应不同形状的输入和卷积核。