Error Message "No CUDA-capable device is detected" Displayed in Logs

Symptom

1. 'failed call to cuInit: CUDA_ERROR_NO_DEVICE:  no CUDA-capable device is detected'
2. 'No CUDA-capable device is detected although requirements are installed'

Possible Causes

The possible causes are as follows:

• CUDA_VISIBLE_DEVICES has been incorrectly set.
• CUDA operations are performed on GPUs with IDs that are not specified by CUDA_VISIBLE_DEVICES.

Solution

1. Do not change the CUDA_VISIBLE_DEVICES value in the code. Use its default value.
2. Ensure that the specified GPU IDs are within the available GPU IDs.
3. If the error persists, print the CUDA_VISIBLE_DEVICES value and debug it in the notebook, or run the following commands to check whether the returned result is True:

   import torch
   torch.cuda.is_available()

Summary and Suggestions