Solved by ptrblck in post #9 
              
              
                Based on the size, the CUDA context seems to be initialized on GPU0 (and I thought we got rid of this, but cannot find the issue on GitHub). 
Anyway, if you only want to use a specific device, you execute your script via 
CUDA_VISIBLE_DEVICES=1,2 python script.py

to mask all other devices. 
Note th…