from https://pytorch.org/docs/1.1.0/tensor_attributes.html?highlight=torch%20device#torch.torch.device

CLASS torch.device

A torch.device is an object representing the device on which a torch.Tensor is or will be allocated.
torch.device是一個對象，表示在其上或?qū)⒁峙鋞orch.Tensor的設備。

The torch.device contains a device type (‘cpu’ or ‘cuda’) and optional device ordinal for the device type. If the device ordinal is not present, this represents the current device for the device type; e.g. a torch.Tensor constructed with device ‘cuda’ is equivalent to ‘cuda:X’ where X is the result of torch.cuda.current_device().
torch.device包含設備類型（“ cpu”或“ cuda”）和該設備類型的可選設備序號。
如果設備序號不存在，則代表設備類型的當前設備；
例如 用設備’cuda’構(gòu)造的torch.Tensor等效于’cuda：X’，其中X是torch.cuda.current_device（）的結(jié)果。

A torch.Tensor’s device can be accessed via the Tensor.device property.
可以通過Tensor.device屬性訪問torch.Tensor的設備。

A torch.device can be constructed via a string or via a string and device ordinal
可以通過字符串或通過字符串和設備序號構(gòu)造torch.device

Via a string:

>>> torch.device('cuda:0') device(type='cuda', index=0)>>> torch.device('cpu') device(type='cpu')>>> torch.device('cuda') # current cuda device device(type='cuda')

Via a string and device ordinal:

>>> torch.device('cuda', 0) device(type='cuda', index=0)>>> torch.device('cpu', 0) device(type='cpu', index=0)

NOTE
The torch.device argument in functions can generally be substituted with a string. This allows for fast prototyping of code.
函數(shù)中的torch.device參數(shù)通常可以用字符串替換。
這樣可以快速編寫代碼原型。

>>> # Example of a function that takes in a torch.device 帶有torch.device的函數(shù)示例 >>> cuda1 = torch.device('cuda:1') >>> torch.randn((2,3), device=cuda1) >>> # You can substitute the torch.device with a string 您可以用字符串替換torch.device >>> torch.randn((2,3), device='cuda:1')

NOTE

For legacy reasons, a device can be constructed via a single device ordinal, which is treated as a cuda device. This matches Tensor.get_device(), which returns an ordinal for cuda tensors and is not supported for cpu tensors. 出于遺留原因，可以通過單個設備序號（被視為cuda設備）構(gòu)造設備。 這與Tensor.get_device（）匹配，后者為cuda張量返回序數(shù)，而cpu張量不支持該序數(shù)。 >>> torch.device(1) device(type='cuda', index=1)

NOTE

Methods which take a device will generally accept a (properly formatted) string or (legacy) integer device ordinal, i.e. the following are all equivalent: 使用設備的方法通常會接受（正確格式化的）字符串或（舊式）整數(shù)設備序數(shù)，即以下所有等效方法： >>> torch.randn((2,3), device=torch.device('cuda:1')) >>> torch.randn((2,3), device='cuda:1') >>> torch.randn((2,3), device=1) # legacy 與50位技術專家面對面20年技術見證，附贈技術全景圖

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