C++调用pytorch模型

本文节选自我的博客:C++ 调用 pytorch 模型

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前言

记一次C++调用pytorch模型踩坑记录,跨语言是AI中急需解决的问题,本文采用#include 执行python代码

问题:Cant open python file!

C++调用pytorch模型_第1张图片

解决办法:将python环境的Dlls文件复制过来(通过sys.path排除)

C++调用pytorch模型_第2张图片

问题:returned a result with an error set

原因分析:Python文件执行时间太长耽误了C++主线程
C++调用pytorch模型_第3张图片

解决办法:C++启动多线程调用Python(仍然无法解决)

另外的方法:一条一条执行每条python指令(已解决)

这样就可以运行处模型结果

#include "workthread.h"
#include 
#include 
#include 
QMutex mutex;
WorkThread::WorkThread()
{

}
void WorkThread::run()
{
    mutex.lock();
    Py_Initialize();          //初始化Python解释器
    if ( !Py_IsInitialized() )
    {
        qDebug()<<"python初始化失败";
    }
    else
    {
        //PyRun_SimpleString("import sys");        //执行单句Python语句,用于给出调用模块的路径,否则将无法找到相应的调用模块
        //PyRun_SimpleString("print(sys.path)");                       //在C++中执行python语句

        PyRun_SimpleString("import torch");
        PyRun_SimpleString("import numpy as np");
        PyRun_SimpleString("from torch.autograd import Variable");
        PyRun_SimpleString("from torchvision import transforms");
        PyRun_SimpleString("from PIL import Image");
        PyRun_SimpleString("img = Image.open('1.jpg')");
        PyRun_SimpleString("transform = transforms.Compose([transforms.Resize((300, 300), interpolation=2),transforms.ToTensor(),transforms.Normalize(mean=[0.5, 0.5, 0.5], std=[0.5, 0.5, 0.5])])");
        PyRun_SimpleString("img = transform(img)");
        PyRun_SimpleString("img = img.unsqueeze(0)");
        PyRun_SimpleString("im = Variable(img)");
        PyRun_SimpleString("Resnet_model = torch.load('Resnet18_1.pkl', map_location=lambda storage, loc: storage)");
        PyRun_SimpleString("Resnet_model.eval()");
        PyRun_SimpleString("pre = Resnet_model(im)");
        PyRun_SimpleString("numpy_array = pre.detach().numpy()");
        PyRun_SimpleString("numpy_array = np.squeeze(numpy_array, axis=0)");
        PyRun_SimpleString("output_np = np.argmax(numpy_array, axis=0)");
        PyRun_SimpleString("pre_data = output_np.astype(np.uint8)");
        PyRun_SimpleString("print(pre_data)");
        PyRun_SimpleString("print('end')");

        PyObject* pModule = PyImport_ImportModule("use_model");  // 这里的test_py就是创建的python文件
        if (!pModule)
        {
                qDebug()<< "Cant open python file!\n" << endl;
        }
        else
        {
            PyObject* pFunhello= PyObject_GetAttrString(pModule,"hello");  // 这里的hellow就是python文件定义的函数
            PyRun_SimpleString("print('!!!!!!!')");                       //在C++中执行python语句
            if(!pFunhello)
            {
                qDebug()<<"Get function hello failed"<< endl;
            }
            PyObject_CallFunction(pFunhello,NULL);
        }
         Py_Finalize();
    }
    mutex.unlock();
}

有任何疑问和想法,欢迎在评论区与我交流。

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