feevos commented on issue #2910: Helper function to get GPU device number?
   @kenfehling  I get the same error when I run this command on my laptop 
(single GPU) but not on the HPC cluster. Somehow the key  
```'CUDA_VISIBLE_DEVICES'``` in the ```os.environ``` dictionary is missing from 
my laptop. 
   When I use (CSIRO - BRACEWELL HPC facility - 4 GPUs per Node) 
```os.environ["CUDA_VISIBLE_DEVICES"]``` I get ```'0,1,2,3'```

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