In the end, thanks to this post Fixed submission failing on Portal, I managed to fix it by moving the imports inside __init__ and other functions. After that, I was finally able to get a score. Thanks a lot to @bha51 for the hint!
One thing I’d still like to know: is there any way to find out which CUDA version is installed on the AWS evaluation platform? I couldn’t find that information documented anywhere @Yadunund
Regards!