pytorch--cpu与gpu load时相互转化

Posted 2021-12-24 llfctt

pytorch------cpu与gpu load时相互转化 torch.load(map_location=)学习

将gpu改为cpu时，遇到一个报错：RuntimeError: Attempting to deserialize object on a CUDA device but torch.cuda.is_available() is False. If you are running on a CPU-only machine, please use torch.load with map_location=‘cpu‘ to map your storages to the CPU.此时改为：

torch.load("0.9472_0048.weights",map_location=‘cpu‘)

假设我们只保存了模型的参数(model.state_dict())到文件名为modelparameters.pth, model = Net()

1. cpu -> cpu或者gpu -> gpu:

checkpoint = torch.load(‘modelparameters.pth‘)

model.load_state_dict(checkpoint)

2. cpu -> gpu 1

torch.load(‘modelparameters.pth‘, map_location=lambda storage, loc: storage.cuda(1))

3. gpu 1 -> gpu 0

torch.load(‘modelparameters.pth‘, map_location=‘cuda:1‘:‘cuda:0‘)

4. gpu -> cpu

torch.load(‘modelparameters.pth‘, map_location=lambda storage, loc: storage)