UserWarning: CUDA initialization: CUDA unknown error - this may be due to an incorrectly set up……

UserWarning: CUDA initialization: CUDA unknown error - this may be due to an incorrectly set up environment, e.g. changing env variable CUDA_VISIBLE_DEVICES after program start. Setting the available devices to be zero. (Triggered internally at …/c10/cuda/CUDAFunctions.cpp:109.) return torch._C._cuda_getDeviceCount() > 0

1. 问题描述

实验室服务器崩了好几次之后，CUDA突然用不了

import torch

torch.cuda.is_available()

通过上面的命令，一直都是False，并伴随下面的报错信息

UserWarning: CUDA initialization: CUDA unknown error - this may be due to an incorrectly set up
environment, e.g. changing env variable CUDA_VISIBLE_DEVICES after program start. Setting the
available devices to be zero. (Triggered internally at …/c10/cuda/CUDAFunctions.cpp:109.)
return torch._C._cuda_getDeviceCount() > 0

2. 解决办法

重装pytorch和CUDA也无济于事，后面查到是因为ubuntu在suspend出现的问题，重启服务器物理机就可以了。

重启，问题解决。