vinx13 commented on PR #16903:
URL: https://github.com/apache/tvm/pull/16903#issuecomment-2064842277

   it's not because `cudaGetDeviceCount`, when I ran the test, I found that 
there are multiple calls to `GetAttr`, the first call is to check `kExist` and 
it always return true, the subsequent call fails because of setting 
`CUDA_VISIBLE_DEVICES=''`


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