PyTorch在CentOS上的模型部署有多种方法,以下是一些常见的方法:
TorchScript是PyTorch的一种序列化格式,可以在不依赖Python解释器的情况下运行模型。以下是使用TorchScript进行模型部署的步骤:
import torch
import torchvision
model = torchvision.models.resnet18()
example = torch.rand(1, 3, 224, 224)
traced_script_module = torch.jit.trace(model, example)
torch.jit.script
编译模块。class MyModule(torch.nn.Module):
def __init__(self, n, m):
super(MyModule, self).__init__()
self.weight = torch.nn.Parameter(torch.rand(n, m))
def forward(self, input):
if input.sum() > 0:
output = self.weight.mv(input)
else:
output = self.weight + input
return output
my_module = MyModule(10, 20)
sm = torch.jit.script(my_module)
ONNX(Open Neural Network Exchange)是一种开放格式,用于表示深度学习模型。PyTorch支持将模型转换为ONNX格式,然后在多种平台上进行部署。
import torch
import torchvision.models as models
model = models.resnet18(pretrained=True)
example = torch.rand(1, 3, 224, 224)
torch.onnx.export(model, example, "resnet18.onnx", verbose=True)
import onnx
import onnxruntime as ort
# Load the ONNX model
model = onnx.load("resnet18.onnx")
ort_session = ort.InferenceSession("resnet18.onnx")
# Run inference
inputs = {ort_session.get_inputs()[0].name: example.numpy()}
outputs = ort_session.run(None, inputs)
PyTorch提供了C++ API,可以将模型编译为TorchScript并在C++中加载和运行。
import torch
import torchvision.models as models
model = models.resnet18(pretrained=True)
example = torch.rand(1, 3, 224, 224)
traced_script_module = torch.jit.trace(model, example)
traced_script_module.save("resnet18.pt")
#include <torch/script.h>
int main(int argc, const char* argv[]) {
torch::jit::script::Module module;
try {
module = torch::jit::load("resnet18.pt");
}
catch (const c10::Error& e) {
std::cerr << "error loading the model\n";
return -1;
}
// Run inference
at::Tensor input = torch::rand({1, 3, 224, 224});
at::Tensor output = module.forward({input}).toTensor();
std::cout << output << "\n";
return 0;
}
Docker可以简化部署过程,将整个模型和环境打包在一起。
FROM pytorch/pytorch:latest
COPY . /app
WORKDIR /app
RUN pip install -r requirements.txt
CMD ["python", "app.py"]
docker build -t pytorch-resnet18 .
docker run -p 5000:5000 pytorch-resnet18
通过以上方法,您可以在CentOS上成功部署PyTorch模型。选择哪种方法取决于您的具体需求和环境。