关于torch.nn.DataParallel的问题

Problems about torch.nn.DataParallel(关于torch.nn.DataParallel的问题)

问题描述

我是深度学习领域的新手.现在我正在复制论文的代码.由于它们使用多个 GPU，因此代码中有一个命令 torch.nn.DataParallel(model, device_ids= args.gpus).cuda().但我只有一个 GPU，什么我应该更改此代码以匹配我的 GPU 吗?

I am new in deep learning area. Now I am reproducing a paper’s codes. since they use several GPUs, there is a command torch.nn.DataParallel(model, device_ids= args.gpus).cuda() in codes. But I only have one GPU, what should I change this code to match up my GPU?

谢谢！

推荐答案

DataParallel 也应该在单个 GPU 上工作，但您应该检查是否仅 args.gpus包含要使用的设备的 id(应为 0)或 None.选择 None 将使模块使用所有可用的设备.

DataParallel should work on a single GPU as well, but you should check if args.gpus only contains the id of the device that is to be used (should be 0) or None. Choosing None will make the module use all available devices.

您也可以删除 DataParallel，因为您不需要它，并且仅通过调用 model.cuda() 或我更喜欢的 model.to(device) 其中 device 是设备的名称.

Also you could remove DataParallel as you do not need it and move the model to GPU only by calling model.cuda() or, as I prefer, model.to(device) where device is the device's name.

示例:

这个例子展示了如何在单个 GPU 上使用模型，使用 .to() 而不是 .cuda() 设置设备.

This example shows how to use a model on a single GPU, setting the device using .to() instead of .cuda().

from torch import nn
import torch

# Set device to cuda if cuda is available
device = torch.device("cuda" if torch.cuda.is_available() else "cpu")

# Create model
model = nn.Sequential(
  nn.Conv2d(1,20,5),
  nn.ReLU(),
  nn.Conv2d(20,64,5),
  nn.ReLU()
)

# moving model to GPU
model.to(device)

如果你想使用 DataParallel 你可以这样做

If you want to use DataParallel you could do it like this

# Optional DataParallel, not needed for single GPU usage
model1 = torch.nn.DataParallel(model, device_ids=[0]).to(device)
# Or, using default 'device_ids=None'
model1 = torch.nn.DataParallel(model).to(device)

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