Pytorch部署：用C++調用Pytorch生成的模型

Loading a TorchScript Model in C++

The following paragraphs will outline the path PyTorch provides to go from an existing Python model to a serialized representation that can be loaded and executed purely from C++, with no dependency on Python.

A PyTorch model’s journey from Python to C++ is enabled by Torch Script, a representation of a PyTorch model that can be understood, compiled and serialized by the Torch Script compiler.

步驟：

• Step 1: Converting Your PyTorch Model to Torch Script
• Step 2: Serializing Your Script Module to a File
• Step 3: Loading Your Script Module in C++
• Step 4: Executing the Script Module in C++
• Step 5: Getting Help and Exploring the API

 

總結：

先生成torch script，這個script對象能被torch script compiler理解編譯序列化。

通過：

traced_script_module = torch.jit.trace(model, example)

或

my_module = MyModule(10,20)

sm = torch.jit.script(my_module)

方法。

然後serlizing，變成pt文件that can be loaded and executed purely from C++

traced_script_module.save("traced_resnet_model.pt")

然後C++中load它，

module = torch::jit::load(argv[1]);

輸入輸出

std::vector<torch::jit::IValue> inputs;

inputs.push_back(torch::ones({1, 3, 224, 224}));

// Execute the model and turn its output into a tensor.

at::Tensor output = module.forward(inputs).toTensor();

std::cout << output.slice(/*dim=*/1, /*start=*/0, /*end=*/5) << '\n';

注意：用C++使用pt模型的時候要依賴於libtorch

 

參考文獻

https://pytorch.org/tutorials/advanced/cpp_export.html